Others answered to your comment very well but I'd like to add something.
With my group, after the weeklies on Tuesday, we would go in Expert roulette with 1 tank and 3 DPS.
I was there as a DRK, before 6.1, we could clear every pack before I had a chance to die. Including the first 90 dungeon were gear is synchronized.
Healing as a healer is fun.
DPSing as a healer is not fun.
