I played a resto shaman from vanilla through WotLK and can say running heroic dungeons in TBC was about the most fun I had in that game. Roles were important, community was important, and if you were bad it was very obvious. Cross realms/raid finder and making every class require button mashing every single damn GCD really ruined the game toward the end of WotLK.
For healing as a shaman, TBC was really the golden age. Vanilla was fun with mana being so scarce (most didn't know about all the consumables you could use) but spell choices were minimal. WotLK had waaaaay to much mana regen and the game become soley Chain heal nonstop even if people were full HP and you wouldn't oom (which worked splendidly for me all the way through Heroic IC 10).
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