I've been playing healers too long, and now I have the ever-annoying Healer's Instinct. Even when I play melee or DPS chars, I'm constantly watching the HP bars of my partymates, then spamming the hotkey my cleric had Heal set on and sobbing when the bar isn't shooting up. Sometimes my fingers twitch cause I want to heal so bad. >_< Better just to spare myself the pain and stick with healing.
Plus, I love it.
It keeps me awake.