Aye.. I don't usually use outlines...period. I don't use structure or stick figures, I try to challenge myself by drawing it straight from my mind. It works sometimes, sometimes it doesn't because I don't have a completely clear picture of it.
But I have to admit, when I have to deal with alot of perspective and such I use outlines a lot.
*shrug* Then again, I've only started drawing again recently and i'm happy that i'm still good at shading.