I've never taken public transportation. I've had a car since I was 14, and have driven everywhere. I'm in a the Midwest, rural farm country, kids around here get a farm permit at 14. There really isn't any public transportation that I know of out here either. There is in the bigger towns though.
I have used taxi, bus, and train a lot. I frequently use the bus now and take a cab once a month to do shopping. I used to take the train back home all the time to travel to my home town. They don't have the train in this part of Ohio where I am at. It makes me sad because it is less to travel with my membership and it is comfortable.
I am sure I forgot other forms of pubic transportation, sorry! Just include what ever it is on your comments after choosing "other", thanks!
I made it multiple just because it's easier, but really, I would prefer one selection.
Other then a double decker bus tour in the UK and several London and Paris subway rides (clean, nice subway in London, dirty urine smell subway in Paris), I have not used any "public transport" as an adult. (well, except airplanes, of course).
Since graduating college, I have not lived in areas with great public transport - and for the past 20 years I've had a home office. I ride the trolley downtown when I get called for jury duty - about 1/year.
We don't have much of a train/light rail system here yet, so I definitely take the bus more often. Light rail on occasion when I'm going to the part of town it does (which isn't often). I avoid taxis like the plague if I can. They're pretty pricey here, and most of the drivers are horrible.
Buses - the local transit acronym is "SCAT" and it really is. It took me three hours to get to the college by bus when it takes twenty minutes by private car. Although it took me only two hours to get to the other campus that normally takes about forty minutes by car. There's no other public transit here. There's been talk of getting a light rail from here to Orlando, but nobody wants to put out the money for it.
I loved visiting Boston because you don't need a car - I've taken the commuter rail and the subway while there (and taxi a few times). I love taking public transit up there because it's so efficient.