I have often used mass trans...but it has to be convenient. In grade school I would occasionally take the Greyhound in the afternoons to get home to the farm: the bus station was 1.5 blocks from school, and home was less than one half mile from the highway. Visiting grandparents in town, the city bus stop was one half block from their home, and a straight shot into town (before malls). My internship was downtown Atlanta: the bus was the only option. The stop was about one quater mile from the apartment, and again a straight shot to work.
Things are usually not that convenient. If I were seeking to live in an urban area today, I would demand walking distance to a transit stop.