But I have noticed (and been criticized on HN for claiming) that the parenting cultural bubble in SF seems completely unknown to many other subcultures. It is indeed a very good community, though.
You're right that they're practically suburbs though. Somebody did a transit-scaled map of SF and it actually takes longer to get from the Outer Sunset to downtown than from Mountain View, 50 miles to the south. One of the biggest problems with SF is that the public transportation system sucks, since it's such a patchwork of independent agencies. (Residents of these areas might consider this a feature rather than a bug, though, because it keeps the homeless, poop, drugs, etc. out of their neighborhoods.)
That doesn't take very long on the N Judah.
When I was a kid I grew up in a rural area, an urban area, then a rural area, then an urban area. They were both super cool, but I had more friends I could hang out with in the latter and so my life was automatically better.