Cleric, Shaman, Druid in that order best healers. Cleric is probably the most laid back of them. No real buff to do every 5 minutes, and heals very efficient. Can be boring and hard to loot stuff. Can solo but not really great. Everyone tries being a Battle Cleric at least once.
Bard is VERY busy. Really can't even talk in groups. Not if you are a good Bard, and not afk half the time.
[You must be logged in to view images. Log in or Register.] Play what you want, LONG ways to 60 playing something that sucks to you.