To be honest, I keep forgetting about things like Feint. I set them up in easy to use hotbar keybinds, then forget it's even there. And half the time I forget about buffs like True North. When playing dancer, I tend not to use Shield Samba in part because I forgot about it, and in part because I don't recognize "oh, this is a good time for that ability". I'm too busy focusing on positioning, avoiding aoes, and what attacks are available due to procs.