For an 8:05 ADR at the Polynesian, I would be out by 6:45. The buses start running around 6:30, but tend to run a bit less frequently than regular buses do. So, if you miss the first bus, the wait for the next one shouldn't be too bad if you get there by 6:45. That should get you to MK by 7:15 (stops at S/D)...monorail starts by 7, so you should be able to be at breakfast by 7:40. Early is much better than worrying about being late!!!