Oh god just reading the other responses to this thread I am glad I don't live in the car-dependent place (I did grow up in one though).
Me and the wife just got a baby and we were like "oh my god I am so glad I live walking distance to everything we need, including daycare and pediatrician". To be fair that is not the average where we live either, but kids are already taking themselves to places around 6 years old and most after-school activities are around the school.
In fact we were complaining that now that we have so little time available it is just so boring to _only_ be 3-5 blocks around our home and never go anywhere else. My wife sometimes just take the bus to go anywhere else to walk the baby rather than just doing it around our area.