Hah yeah ... basically I have 2 pairs of jeans I wear. My expensive ones I wear to nice places, and then the Levi's. $50, lasted me roughly 6 months of regular wear. Time to get new ones!
For the summer I also prefer wearing shorts. Cutoff jeans, usually.
Jeans I do think you are right about not being *that* great for cycling. At least my jeans. I think the tightness of them makes it more difficult for me to pedal. Could just be my imagination though, but I have had roadies come up next to me while I'm commuting and say stuff like "How do you ride in clothes like that?!?".