I do try my best, but im forced to. Maybe its something we should all do. Pick a lens and only take that one when you head out. This way your forced to learn how to compose the best you can with that lens. A self challenge I guess.
I'd by no means call myself that good a photographer but I found when I stuck to using prime lenses it really helped with composing shots and also moving around, getting in close to stuff etc. Often I guess limiting yourself forces you to get better.
I still love the 50mm prime I have but Nikon have brought an affordable 35mm f1.8 out which I'm quite keen to have. So skint at the moment though so I can't really get it. At the moment I'm using rangefinders/film so my D40 is gathering dust.