Clearly, you should have quit healing a long time ago. Omnitron was easy in all blues the 1st week WoW came out, and was even easy on hard mode. And I remember paladins being, if anything, mildly overpowered during Cataclysm. Holy Paladins too hard for you....?
Also, you know healers have meters too, right? Or did you just never see yourself on them?