The role of a Shaman does not really change much at all once you get Canni and your dog. It just seems to get a LOT more busy with harder mobs and constant pulls. More Slows, more Haste, more Roots, etc, you get the idea. It all seems to come at a lot faster pace with a better chance to be oom or "screw up".
I can only stand to play mine in a group once in awhile anymore. Just WAY too many people wanting buffs all the time. Even people not in your group wanting them lol. And with Canni dance NEVER a break. It can be stressful as hell compared to the Wizard that is casting 2 nukes every 10 minutes.
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But it is a great class for both grouping and solo. All 3 classes have their advantages. Barb not evil, Ogre no frontal stun, Troll free Fungi at high level. I went Barb. Can't stand ducking in zones even though you can use Shrink and and make Shrink pots.
But I think grouping the Troll re gen is a big edge and Solo the Ogre Frontal Stun does help. When Velious comes out we all probably wish we were Ogres if solo is your thing...