Hi Dan!
I am excited for your upcoming visit to
Walt Disney World. The bus transportation from the
Disney's All Star Value Resorts has been just fine in my experience. The Value Resorts are typically heavily populated because they offer such a great value for the money. During the theme park opening and closing hours there seem to be extra buses running back and forth to the parks.
Pop Century does have its own bus from the parks, but I found that it does not seem to travel as frequently as I would have preferred. (When you are tired at the end of the day, it will seem as if your bus is always the one that has not come.) The All-Star Hotels usually share one bus, so it will be a little more crowded.
I have resolved that the bus travel is probably not the quickest way to get around the resort, but when I am on vacation it is just fine with me to get to my destination when I get there. One little tip, if you have breakfast reservations give yourself a solid hour to an hour and a half to maneuver around on the bus system for an on time arrival. Other than that go with the flow, and let Mickey do the driving!