I like having a car because I like having my own space and NOT dealing with cranky "other" people on the bus, along with the possibility of having to stand after a long day due to the bus being crowded.
I was there in May. DH and I were going to MK for the 24 hour day. We stayed at CBR and thought we'd try the bus to avoid the TTC. We got to the bus stop at 5:40 and found quite a large group of people there, some of whom had been waiting for FORTY MINUTES! This makes me think that no buses had come to that stop at all that morning. We turned right around and got in the car. The car is way more reliable than the Disney buses, I think!