Like drcowell, I'm car-free, although for me it's been since fall of '04.
I don't miss driving at all; when I watched the last car roll out of the driveway on the back of the tow truck, I only felt the sense of loss OF FAMILIARITY. It was a fairly new idea, not being car-equipped. I'd been bike-commuting for nearly 4 years already, driving rarely, all by choice. It didn't take long to realize that I not only had ditched the car, I'd CUT THE ANCHOR CHAIN!
I need NO reinforcement to prefer the bike over the car. (And even if I did, I got it about 3 years ago, when I borrowed a family member's car for some holiday shopping; within 6 miles, I was on the edge of a murderous rage.)