This is a very legitimate question: In the US, where is it not?
Public buses aren't safe, clean, or timely. Where I am, it's 2.5 hours rather than a 26 minute commute by car. The only reason you ride one is usually if you are already in the proximity of your destination, especially if that destination is downtown. For all other cases, private or ride-share makes way more sense. We're talking buses here, not shuttles, light rails, monorails, etc.
I worked at IBM Research, totally unlike the rest of IBM in terms of how it was run, and being a non-US person it was quite natural for me to take the bus to work because either that or train is how you get to work. I never met any coworkers on there, although I did get to know the cafeteria staff, cleaners, and so on, who all caught the bus, quite well.
London buses are a pleasure in contrast.