I didn't buy a car until I had the kiddo.
Man, taking a puking hallucinating febrile toddler to the ER by bike would be a toughie! And participating in the school band carpool with 3 adolescents, a bassoon, a french horn, and a clarinet would definitely strain my granny gear!
Someday I'd really like to just do the bike/bus/occaisional car rental thing. Sometimes I look back on my car-less bike-n-bus life and get wistful and melancholy. Cars are expensive, no doubt about it. And stressful.
(and as my nearest and dearest can attest, I'm much calmer on a bike than driving a car!)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson