There's no reason for me personally to use public transit in my area. We do have buses even out here in the 'burbs but I don't need to use it
However I've used transit in Vegas (both the buses and the monorail), the subways, bus and/or light rail system or combination in NJ (Newark & West New York) & NYC, Boston, D.C. and STL plus Frisco, CO. If you want to use it I did use the campus buses at my alma mater plus one time the city where my alma mater was located at their public transit.
Used the buses at WDW to get from park to park when needed back in 2011 but didn't use the bus at all in 2017-we just drove but we were onsite versus offsite like in 2011 where our hotel had a free shuttle to the parks and then we used Disney's transit when needed to get from park to park.
TBH the college campus buses were probably the hardest simply because just about everyone had a backpack, messenger bag, etc and campus was on top of a hill and normally it was full of standing students. Now granted you didn't normally have too too far to go but still-up the hill with lots of backpacks, etc in the way. The ones that had the hardest is the buses that is run by my county that goes in between my alma mater (over 30miles away) and the Community College here. I never rode it but it took about 50mins due to bus speed on the highway and it was packed to the brim with many having to stand the entire time.
When I rode the WDW bus in 2011 I didn't find it bad at all other than not knowing when the next bus was going to come it was a bit frustrating to have to wait 45mins for an AK bus. Since we didn't ride the buses in 2017 when we stayed on site I can't comment on how the resort buses situation was from the All-Stars.