As others have mentioned DCA has quite a few more rides than Epcot or HS so the crowds are dispersed over 6 or 7 e-tickets rather than waiting for one of the 3 or 4 e-tickets in Ep or HS. I don't know about dust free rooms but the WDW print is in much better shape than the DCA print, the rights side in DCA is almost unwatchable with all the dirt and defects. I read on another site that the Soarin refurb at DCA is being delayed because the new projectors weren't working out as they hoped. Here's the rumor: "Unfortunately, there are issues with the new 4K projectors that have the IMAX folks and WDI at odds. Basically, the 4K IMAX projectors don’t quite work with Soarin’s screen size. There’s a lower scale HD projector that IMAX is offering in place of the 4K version, but WDI is firm on what then want and will wait for the 4K projectors to be ready. As frustrating as that is for everyone, it is probably the best thing for the long term operation of this attraction." The new 4K projectors will actually have a much lower resolution than the existing 70mm Imax projectors but they'll be much easier to maintain since the picture won't deteriorate and get "dirty" like the existing film does.