Why are Healers allowed to be insanely overpowered?

[Skeet]

I am actually a healer. Im a newer/ish player to the game. I usually play healers in all my PvP mmos. AND im usually the one that is last alive since all the other healers are usually dead ^_^. I didn't ask if healer was your best or worst class. I'm just saying in general that all healers get interrupted in casting a spell/heal.

I know you didn't ask about it, I'm just saying that they aren't as "interrupted-prone" as you make them out to be.