I was there. Well, not actually in the stadium. I am one of the many volunteer staff at the Olympic Park. I was working at the entrance gates loading bags onto the x-ray machines. Think of me as the unpaid equivalent of G4S. The atmosphere was terrific even just as the public were arriving.
My shift finished at 8:30 p.m. We were not allowed to hang around (spoil sports) so I went home and got back by 10:00 to see the last 2 hours on TV. The bit I saw was mostly enjoyable. The entrance of the teams always tends to drag on, but it is an essential part of the ceremony and the lighting of the cauldron was inspired theatre. Great stuff.