I don't disagree with the sentiment here, but want to add a few comments: If you have to walk once you get off of Bart (and let's be honest, the Bart stops are

I don't disagree with the sentiment here, but want to add a few comments: If you have to walk once you get off of Bart (and let's be honest, the Bart stops are pretty well spaced out), your commute goes up. SF transit (the 38 Geary, the N) might seem slower, but you typically don't have to walk as far when you get off. Also, depending on time of day, Muni runs more frequently than the specific Bart lines. Compared with NY Metro (or most other major cities), Bart stops are spread thin. And quick nit on the Presidio: it's a lovely place to live and if you live there, there is a free shuttle to downtown called the Presidigo that's easy and efficient.