I've had to set very specific rules for myself for DPS'ing on WHM in dungeons and whatnot. Like "Spam Holy 3-4 times, then turn off Cleric Stance immediately." I can't tell you the number of times I just plain blank out that I'm in Cleric Stance. Totally forget. Sometimes it takes me like...five or six Cure I/II's or worse, going "IS THE TANK TAKING INFINITE DAMAGE?! WHY IS HE NOT HEALED?!" before I realize that no...I'm just a moron.