Hmm.. now that I think about it a bit, nope. Spend the vast majority of my time in A, aperture priority mode. For some things I switch to S, shutter priority, and for some stuff it's M - manual. Those are really the only three settings I use.
Not usually, I'm mostly in manual but I'll use Av or Tv sometimes depending on what I'm looking for. Quite often I'll set up some custom modes or if I'm just setting up a quick snapshot I'll just use P or Auto.
M (manual). I went from using all auto everything straight to M back in 2008 if I remember correctly. I think I've used A, S or P less than 5 times since then... I'm not sure why, I just got used to it and now it's the most comfortable thing to do.
... although sometimes if I'm lazy and just taking snapshots I'll use auto or sport. That's comfortable, too.
Not on purpose. I did mess around with some of the picture presets for S&Gs. Most of those are just for people who don't know how to edit.
As far as modes, well depends on the situation. If I have time to fart around with each shot I will do manual. If I have a particular dof in mind I will use aperture mode. If stopping motion I will use shutter priority.
Using only manual mode doesn't mean anything and doesn't make you a professional. A true professional knows when to take advantage if everything your camera has to offer.