I love the bus system, granted it's not perfect nor better than a personal chauffeur. We really enjoy being able to go everywhere and not deal with a car, parking, etc. If you're on a strict schedule to see and do everything it may not work well.
I agree that rushing to see everything is a HUGE mistake. We like to make being on vacation relaxing. Disney is great for letting them take care of you. Take your time and enjoy that someone else is getting you everywhere.
We like to take our time to see and do lots of different things everyday. We'll bus to MK, then monorail to Epcot, walk to Boardwalk, then boat to MGM, bus to DTD, then boat home to Dixie Landings. That's a lot of driving with your own car.
The bus drivers, particularly at the end of the day, can be entertaining themselves.
sorry, about drifting a bit.