Just slowly making my way towards level 85 on my Holy Priest in World of Warcraft. Healing is a lot more enjoyable for me, since first of all you don't wait around on queues, and then you generally have more stuff to do, in a dungeon. You have to make sure everyone stays alive, bubble the tank, heal everyone else, think about wether the boss might stun you next so you can cast some HoTs, it's a lot more exciting than just casting spells in a rotation as a DPS, or even tanking, at least for me.
Throne of the Tides is one of the more annoying dungeons though, since around levels 80-82 you're stick with it and Blackrock Depths, since the other dungeons require an iLvl minimum of your gear. So if you're like me and can't stand questing with anything else than a paladin or a DK, you'll have to stick with those two, until you get the item drops. Which might take a good 20 runs.
If you have experience with RPGs tell me which classes/roles you prefer.