Our first trip as a couple, we used only the bus. We have to drive all over kingdom-come to get anywhere at home, so thought it would be nice to let someone else do the driving. Wroooong. We didn't have any big problems with buses showing up per se, but it just took so long to just get down the road a little ways. Add to that the herd mentality (stampede!) and rudeness of guests to each other (and no, I don't remotely mean whether someone gives someone else a seat), we were just

in general. I mean, we won't wait in line for a ride longer than 30 minutes, but we'll take a bus that takes us at least double the time to get there vs. a car? Not for us.
So we've rented a car since and it has been incredible. The only time we don't use it is when we are in a direct route to MK via boat or monorail. In fact, I was just looking at our last trip (May '08), and noticed the time stamps on our night of arrival. We left WL about 4:15 pm, and I have a picture of myself in the parking lot at DHS at 4:29 pm. We took the tram, entered DHS, rode ToT twice, had dinner at CS, shopped 2-3 shops, and the next picture has a time stamp of 6:58 pm of me on MK Main Street with the castle (Spectro night). And that INCLUDES the time it takes drivers to MK having to make a second connection via monorail or boat.
In comparison, one afternoon that same trip, about 3 pm, we decided to take the bus to Epcot. We waited about 30 minutes for one to arrive, then it had to make another stop for guest pickup, and overall about an hour later we were just pulling up to Epcot. Oy... That same journey using a car would have taken maximum half that time to be standing at the gate with ticket in hand. And no one would have wacked me in the head with their bag as they walked past me to a seat
