On the People Mover, I love the part where you are suddenly inside the Space Mountain portion where it is completely dark and all you see is shooting stars. I remember when I first rode it, I thought it was going to take off like Space Mountain did and it kind of scared me. (Now, that is my favorite ride in Tomorrowland, aside from Space Mountain of course. Space Mountain, getting stuck in the queue is my favorite. Sounds lame I know, but I could listen to the tunnel music for hours...)
I also really like seeing the models of the alien planets from above when riding the People Mover. Reminds me of being in the Garden Grill and seeing what the people see from the ride Living With the Land from a different perspective.