I lived mostly car free in Atlanta because the Marta station is one flight of stairs down from the airport terminal, and I could get to my lab in GSU in downtown Atlanta in less than 30 minutes, midtown Georgia tech campus in similar time, my first apartment in Lindberg in 40 minutes, and my second apartment in Sandy Springs on the other side of the city in less than an hour from the airport. Commute to and from my school/lab/apartment was always under 30 minutes and always faster by train compared to car.
These days I fly to the bay area to my office in East Bay. It's 2+ hours commute from either SFO or even OAK because you need to change buses 2 or 3 times. Add 1 more if you count taking the airport shuttle to the BART station. And SJC does not even have a BART connection.
There's fundamental design flaw in public transportation in the US, they almost never connect the population centers. Part of the reason why people are discouraged from using them and they don't get the funding to stay up to date.
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