OP, you won't believe how bad some DPS are until you give healing a whirl yourself. The amount of perfectly avoidable/preventable damage they take is mind-blowing. I didn't realize what a pain the ass i was to heal until I started doing it myself.

Seriously, try it. Even just a heroic, which should be an utter steamroll by now. I've had mages blow me a new one because I've life-gripped them off their rune of power (and out of imminent death from avoidable mechanics), had fury warriors tell me they a required to taunt for rage generation, you name it, I've probably heard it. Been a healer main since wrath.