I think this is taking the point a little too analytical. By that nature - i could argue that Wild West Falls isn't very well themed, as the ride itself is simply a bare concrete channel, with rubber conveyor belts, and some 'wooden' themed boats. EVERYTHING ELSE that makes that ride is just part of the themed area.
Space Mountain, without the lights, wouldn't be very spacey.
Sure - there is an area around doomsday that isn't 'the ride itself' but separate experiences - but come on, how much do you expect to be 'part of the ride itself' when its a stock flat ride?
For me, i think they've done a fantastic job of theming 'the ride itself' as much as they can - every inch of that ride is tied into the overall look.
Every other flat ride in our parks pretty well meets the same definitions - you can't count wipeout's surfboards, the giant wave, the pool underneath it, the sand around it - all you can count is a bit of fibreglass waves above your head...