Raiding is essentially boring unless you're on the pull team, which looks like fun, or you're a cleric in which case it's a weird combination of boredom and tension.

Leveling, I'd say druid has been the most boring. In part that's because I haven't played either of the top contenders, Wizard and Rogue. In part that's because I don't particularly care to solo usually. In groups all you do as a druid is help get people to the hunting spot, sit there, buff people, cast the same heal periodically, and port people out afterwards.

People who think clerics are boring, you just need to have ambition. Do more dangerous things with less people or funky class mixes. Chaotic fights where your tank is getting thrashed and your enchanter has problems with charm and your ranger is offtanking and you're keeping them up at the same time as running crowd control on mobs that have aggroed you, those are such a blast to heal in if you know your stuff.

As people have said though, the most fun class is bard, because it can be whatever you want it to be, or all of those things through the course of a fight. It's the least gear-dependent class imo, and the one that has the most need for a comprehensive understanding of what's going on in a fight and what you can do to help your group. Swarming itself is fun in limited quantities, and by the way allow me to bequeath unto you a trick for strafe swarming - If you strafe with W and A/D and the mouse, and then while you're doing that you hit the enter button (you might need someone to help if you don't have long fingers) then it locks in the strafe, allowing you to kite using only right-click mouse steering, which is much much easier on the fingers.

I play a cleric as my main, and I enjoy it, but for sure, it's the most boring. I give cleric buffs, I heal. Now and then, I do some ghetto CC with Lull and Root, maybe an occasional chip in on DPS if kill speed is slow and I can spare the mana, but for the most part, I buff & heal.

Solo, even vs undead is like watching pant dry, since root/nuke is about all clerics can do solo.

Single group - while watching nothing but HP bars...I sit, I stand, I cast heal, I sit....

Figure on raids, it will be same, except, while watching HP, I also have to watch for the chat command that says my turn in CH chain is coming, then....I sit, I stand, I cast Complete Heal along with chat macro to alert next cleric in chain, eat some mod rods, then I sit...

Not to complain, because I chose this class on purpose for the specific reason of seeing the raid content I missed on the first go 'round back in 2000. But there isn't much to playing a cleric. They are necessary, no doubt, but yeah, they be boring.

On the opposite end, I'd go with bard as least boring, since the ebb and flow of what you're doing can and does change what you do to min/max your part in that. Just too much power and versatility to that class, which is why my highest alt is a bard. I'll get my cleric to 60 and then go all the way the other direction for a new t00n.

EDIT - to what Servant said, yeah, undergeared, weird group composition can make it chaotic, and I have a guild monk who says he "sells cleric sweat and tears by the bottle in EC" because when I type "/g 10m" he thinks that means "pull 6 mobs, please do not even attempt to split, DO IT NOW!" And he clowned me in tells asking me if I was having fun, etc. But even then, that is just stress based on my mana bar can cast X number of heals, and if X is exceeded, I know I am useless and people die. And it's really only stressful after 39 as pickup groups make me reset the point at which I cast CH to see if it will land. But once I have a bead on the tank's HP and how fast it moves based on what is being pulled/killed, even that bit of stress lasts like 3, maybe 4 pulls?

I'm second this one but not on the enchanter portion.

I started p99 as a main cleric and thoroughly enjoyed it until I hit 60. Raiding as a cleric sucked but I dont really enjoy raiding a whole lot so those compounded and burnt me out on the class. It's fun to be the class everyone is begging to join their group but I think it's the lack of power that the class has that kills it. You cant solo hardly anything efficiently (even undead tbh). You have no means of mana regen to be able to nuke much, you can gear for ac and be a bit tankier at the high end which is probably the most fun way to play a cleric (get tanky, use stuns for aggro, heal yourself) but if you take that route, I'm asking why you didnt just make a paladin.

gearing a cleric osnt much fun besides acquiring some high end toys (VP weapons, puppet strings, ragefire armor) because the amount of "power" you gain hits a state of diminishing returns pretty quick. It's very common to hear "hit 4k mana and then main swap" but even my cleric with a buffed 3600 still is more than enough to heal practically anything. Maybe it's just me, but I have a hard time investing in classes that dont get more powerful with gear (clerics, mages, wizards, rogues to an extent) and progression is alot of what keeps the game fun. Sure technically you could make that case for any class but dont tell me you dont feel a difference between a tank with 6100 hp buffed and a tank with 5100 hp buffed. If I'm investing into a character, I want a stronger character not "oh I can cast .5 more CH's now"

This is all my subjective opinion, some people do really love clerics and I will never fault someone for that but it's simply not my style. Maybe one day I'll reconsider.

The most boring class was History with Mrs. Gagliardy.

history was my fav :\ mrs gag was a cow though, true

Bards. No double attack ROFL

Cleric by far, especially if you're raiding.

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I just don't get that. Druids have 1 spell to cast for healing, plus a buff or 2 that adds regen. Clerics have CH, Remedy, Divine Light, Celestial Elixir, Mark of Karn, Word of Restoration, and Heroic Bond as healing options alone, along with a better root and amazing stuns. Druids do 2 things on a raid - buffs and spot heals, and spot healing is not nearly as much of a pressure cooker as being in a CH chain, where literally a 1 second delay in your cast could mean the entire raid wipes, with the blame clearly attributable to the fail cleric.

To each their own I guess, but it really puzzles me that anyone would claim it's more fun to main heal as a druid. I've seen many a cleric that seemingly only used CH and the occasional remedy on caster, and that would be boring, but that's a self-limitation, not an intrinsic limitation of the class.

Notice, nobody said Shaman....that class is a keyboard/mouse killer.

I quit my shaman because i got tired of the endless cannibalizing. I think after the bard, shaman is next in line for cramping the wrists. Even with a macro it was so unbelievably tedious.