I'm compulsive about a few things, but I believe that stems from my life experiences more than a disorder - or rather it's a learned reaction. I never (and I mean NEVER) sit with my back to a door or a window. Even in my own room I've arranged things so that the door is always within sight - hell I even sleep so I can keep an eye on the door. I also don't walk with people to my back if I can help it. I have to be able to see what's going on around me so no one can sneak up on me.
I guess the only thing I'm truly compulsive about is my and my children's safety. I've taken it as far as getting a new security system put in my home. I spent money I didn't have on it because I felt it was needed even if I'm out in the middle of nowhere and even I have a hard time finding my drive way sometimes.
I tend to keep my whereabouts to myself, only letting one or two people know where they can find me, and I need it to be that way. Which is, to me anyway, one of the definitions of a compulsive act. My life has to be this way, I have to be able to control my environment... and when I stop to think about it I realize that it rules everything from my shopping habits (3 am grocery shopping) to where I work (a secure facility with round the clock security guards).
Maybe I should have voted for more than slightly compulsive, no?