Thanks for the first hand account! The most notable thing for me when walking through the museum exhibit of Concorde was that I would not stand up straight in the cabin, which would have really made things super uncomfortable for me. One of the things on my 17 hour 787 flight recently was that I could walk to the galley exit area and perform full stretches in all directions every hour. Not being able to do that would have been really bad for my body and for my sense of claustrophobia.

+1 for the airship idea too - I would book a ticket in a flash.