Studios (and that corner of Tomorrowland with the Stitch show) seem to be really the only places that hanging up all of those trusses and lights would be acceptable. I'm not justifying our lack of nightlife, but setting up all of that equipment on Main Street and leaving it up all the time would look terrible. If they could do something like that on say, New York Street at DHS, that could work.
It's also worth mentioning that most of DCA is under construction walls now. I bet people would mind a heckuva lot more if they pulled something like that off at Disneyland itself, or at any other park, at that. Essentially, if a park is chock-full of walls and construction, trusses and temporary structural supports for lights and speakers doesn't look nearly as bad as hanging up all of those supports on a re-creation of a 20th century American town.
