I was kind of disappointed with the NASM
It seemed most of the displays were exactly the same as they were in 1978. Sure, there were some newer entries like the Voyager and Patty Wagstaff. However, most of the main displays were exactly as I remembered them from my last visit.
I wish I could be there this December when they open the new facility at Dulles. I also wish I had time to visit the restoration facility. However, with a wife who's not exactly an airplane buff (how did that happen?), it wasn't going to happen.