I think the problem with the sliders that Busch had was that a) They were in Rhinefeld and b) the ones they had were more annoying that startling. If they had them in Oktoberfest and were as good as the guy in the video Zach posted, I'd be all for it.
I agree the Verbolten pic is awesome-- it would also be nice if they added some fog down near Nessie's loops, especially with her lighting.
I was also thinking further about Root of All Evil-- not talking about the maze itself (because there's plenty of time for that) I think the queue line is one of the biggest factors here. Deadline and Catacombs have excellent exteriors, Bitten and Fear Fair are decent, and 13 is not great, but at least TRIES with the plaques. Walking by the unthemed side of DarKastle while seeing the trucks go by in the parking lot really takes away. It's breaking one of the big rules of theme parks: don't show off the "real world"-- in this case the parking lot. 13 comes very close, but they still keep it hidden. With RoAE you're BOOM right there in the middle of the parking lot with trucks going by.