At Disneyland Paris, if you pay enough, you can get a VIP fastpass, which entitles you to get into the fastpass line all day as many times as you want. Better still, if the fastpass machine isn't functioning you can go in via the exit and ride the ride over and over as we did with the Rock and Roller Coaster and BTM. We virtually walked onto every fastpass ride for the three days we were there. It was particularly useful on Big Thunder Mountain Railroad which was very busy as there were some technical difficulties and only two trains were running. I don't think they have these at WDW though, but it may be worth asking.
