If a movie was filmed in Widescreen, I buy the Widescreen DVD. Only a handful of my DVD's aren't Widescreen and that's only because they weren't filmed in Widescreen. (A couple of music DVD's, IIRC.)
Widescreen is also way better on computer displays. It gives you much more screen real estate to work with and honestly, I think it LOOKS a lot better! This is one of the reasons I'm gonna be upgrading to an iMac sometime in the near future. I have Widescreen envy. Right now, I use a Dell 1707FP with my mini, and while it's an awesome display, I'd love to have more screen real estate.
So yeah, I'm a huge fan of Widescreen.