Spoiler'd because this confession is a bit, shall I say..."revealing?"
I get this satisfying sense of sado-masochism whenever I play as a healer, which I don't get from the other two roles. While I consider myself to be bad at it, it feels really good when I'm able to DPS and keep everyone alive. I also get some kicks from "getting (too) friendly" with any of the cute characters DF pairs me up with, yet I cease this fooling around when someone makes it clear that they're not comfortable with it. This feeling is further accentuated when they are tanks. It makes me want to "bully" them, keh heh heh heh. Healing is the only role that makes me feel this way, and it makes my gaming experience that more enriching.