All one needs to do is stand at the Haunted Mansion, Splash Mountain or DINOSAUR and revel at the amazing ways in which Imagineers hid the massive warehouse show buildings. Then, after doing that, head over to Tomorrowland and look at this hideous, unthemed blue box with only a canopy obstructing its view.
When I used to take guests backstage, they'd truly MARVEL at the fact Splash Mountain wasn't actually in a mountain, but rather a big warehouse. Here people will just say "what's in big box?" unless they're directly in front of the ride, then they'll know.