I noticed that every time I switched bikes I would LOVE LOVE LOVE it. When I get on the long red one, it's the PERFECT geometry; I can ride it forever. When I get on Black Beauty, she feels so funky-cool and that single speed is just RIGHT for charging up our overpasses... and then I'll get on the Baby Blue Trek and I FLY FLY FLY 'cause she's aluminium.
I decided that a: it's wise to pick the right bike for the right kind of riding, b: you can't have too many bikes and c: I could probably get on ANY bike and LOVE LOVE LOVE it! They're like children... uniquely lovable...