I finally found a good video of Revolution, a bizarre indoor coaster in Belgium that Disney could learn a thing or two from. The ceiling is basically a giant projection screen- when it opened in 1989 the floor was also a big screen with trippy projections - but as guests decided to deposit loose items, the replaced the lower screen with lighting effects. More recently, they redid the ceiling film with a digital projector, but the same trippy film they showed from the start.
THIS is more what I expected of Disney for Space Mountain, but oh well.
Revolution at Bobbejaanland, Belgium
BTW, this coaster has enormous trains - 30 cars with 2 riders each for 60 riders per train.