We use it in MGM at the Aerosmith and TOT rides.
We use it at Epcot on Soarin
We use it at MK for Space Mountain and Thunder Railroad
We skip Test Track at Epcot, DH and I ride in the single rider line and it is quicker than fast pass and 9 times out of 10 we end up in the same car anyways.
We skip it in Fantasy Land, we let the families get them first.