We have only had slower bus service from MK at closing time, and that was only twice. We usually take whichever bus is available, i.e. Swan/Dolphin or YC/BC/BW. For the most part, the bus service is pretty quick and not too full. We also walk through Epcot and monorail to MK a lot. That doesn't work if you want to to at open or take advantage of Extra Magic Hour. But, on those days, we've never had a long wait, nor is the ride that bad. I don't remember having trouble going to AK either. We never have a car, and always use the bus or walk.