When my dad was a CM for that attraction, he took me up there. It's really sad how it looks up there. When I was there, the Rainbow tunnel was still there (and lit up), all the kiosks were still there, but not working (naturally). But there were TV/Monitors just tossed all around and basically a bunch of trash just all over the place. My dad showed me the "green" room where some of the actors get ready (the ones that do some sort of skit when you're exiting the ride... directly to the left of the exit, once you enter Imageworks).
My dad used to go up there and eat lunch sometimes and look out at the park. It's really a shame that they let that prime real estate go to such waste.