When we took Disney transport from MCO we arrived at the waiting area for the buses at about 8:40, were loading by 9 & departed by 9:10. Our bus was the first to leave and first to arrive at the port. It was wonderful entering an empty building, being some of the first to check in, choice of seats, first for pictures with Mickey. It was so relaxing. If I were you I would grab something to go for breakfast and head straight over to the buses. It's much better to relax in the Disney building and on the Disney bus than trying to find something to do that will make you arrive later. Word is also that now if you are using Disney transport, you don't get a PAT, and boarding numbers are instead based on arrival time at the port, so earlier arrival equals earlier on the boat!