Disney has been tinkering with the bus transportation system for a few years now. A couple of years ago they started the "on-demand" program that included dispatching buses during various times of the day. As first instituted, on-demand left a lot to be desired, but with continued fine tuning the current state of the system is getting great reviews. The are presently using a "flexible dispatch" system that directs buses to areas of need rather than running static routes all day. In most cases, this results in wait times of no more than 15 minutes- both from resorts and parks. There are dispatchers at each park to direct incoming buses to a stop where guests have been waiting. The buses do not necessarily run routes between a park and a resort, but are directed to a variety of combinations. I have always been impressed with the general level of transportation at WDW and never drive- even when we have a car with us. The current status of the system has never been better, IMHO. While my recent experiences have been at OKW only, I believe that all resorts are enjoying the same success. There will certainly be times when guests will still experience filled buses, but the present system does address the main issues of the past. Enjoy!