A substantial portion of my childhood is 20-40 minute car rides punctuating every excursion, every new experience. Maybe it’s family time, but mostly I was on my Nintendo DS or GameBoy Color (or reading and getting carsick) and ignoring legs made restless from lack of use. Freedom has its price.
I'm not saying this is the primary reason to have cars and live in the suburbs, but not being forced to share space with every random person in your vicinity is no small thing.
Also, the plenty of people get killed in cars.