No bus problems at all, the longest wait at the resort was 15 minutes, because my slow-poke 4 year old wanted to push her stroller and the MK bus just left. One day at the bus stop, a bus manager was on site at the Congress Park stop, noting the time each bus arrived and left, and waiting for the time reported when the bus reached its desination. I was impressed with his explaining the system and how they track timing.
Even after the 10 pm parade at MK, the wait was short. The wait for DME was also short at the airport. We arrived on 2:30 Sunday and noted on the way home on Saturday around 12:30, we sat near the front and you could hear the buzz from the radio dispatch, the airport waiting time was filling in fast and dispatch was hustling to get buses their, it was load and go! Timing is everything.