One of the very few things I knew about WoW before starting playing, was that I knew from a friend about LFD que, and that healers were in really high demand (he was playing DPS). When choosing the class, I just thought "Priest sounds like this holy guy that should have the best healing spells available", so I just rolled a priest healer (Holy at first, Disc from 4.1 afterwards) and never looked back.
Lately, since MoP hit, our guild had quite an influx of healers, so I tried actually going DPS for raids. Still working on my shadow gear, but I have to say I like DPSing as well, but still, healing is the best.
Edited by MoacaBogdan, 14 January 2013 - 01:04 PM.