The problem with mass transit mostly isn't other people, it's the fact that it rarely goes from exactly where you start to exactly where you want to go. I take mass transit to and from work every day, but in order to get from my house to the commuter rail station, I have to drive a mile to a bus stop where there's parking (the commuter rail lot is small and fills up quickly) and take a bus 2 miles to the train station. Then on the other side of the train ride, I'm still 3 miles from my office, so I hop on a bike share bike and take that to the station nearest my work. Then I walk 2 blocks to my office. And then all of that back again in the afternoon. Lots of people tell me that they drive because they couldn't deal with my crazy routine.

A PRT system would possibly have a station much closer to my house, so there wouldn't need to be a single commuter rail station for a town of 20K people, and therefore no dealing with crowded parking lots. It would likely have a stop at or near my office, as it's a very busy business district (Kendall Sq, Cambridge.)