I saw plenty of unthemed spaces for the other versions of the train ride, and everything was staged on the others versions as well. The other versions of the ride were staged as well. They all had their positions to try and work. The only difference is, is Sleepy Hollow told a story, while the other versions tried to be scary, and failed. (In retrospect.)
I think the problem in general is trying to put a themed attraction as large as the train ride, is really not a feasible thing to do, unless actors are gonna start jumping on to the train to scare people. Which will never, ever happen because of safety reasons.