Been working a new job for a week now and taking public transit exclusively for the first time in three years. I have to say I'm pretty impressed, with one exception. Everything takes 20% longer than I anticipate. Think your one-way trip will be 50 minutes. It'll take an hour. Your BART train to Oakland scheduled for 20 minutes? It'll be four minutes late, or it'll stop midway there. Something.
The schedules for MUNI, BART, and the various shuttles aren't exactly fiction, but they're definitely optimistic.