Ashton, if I could get from my home to work and back, with only, say, two or three times the elapsed time it takes me to travel by car (automobile takes 10-15 minutes, let's say a 45 minute public transport commute), I'd do it.
If there were public transportation that hooked up reasonably close to my house, transporting me to reasonably priced Amtrack (or other train travel) to my parents' house, I'd probably visit them more than once or twice a year.
The trouble is, the U.S. has built itself up into a corner these past five decades or so. The public transportation available sucks and blows, it's easier to use the Interstate to drive my ten or fifteen miles to work than to endure the stupid routes a bus might take (and those buses emite fragrant clouds of particulates, much more than my car anyway.) And thus it's a self-fulfilling machine: you drive, therefore they don't set up more convenient routes, and therefore you drive.