I was at the DIS meet, too. I just missed you!
I agree about the heat.....it wasn't too terribly bad. My hair and the humidity do not mix well so I apologize to anyone who saw my crazy-looking hair! It was much hotter in June 2010.
We didn't encounter as many tour groups as we have in the past. We saw them sitting in stores and on grassy areas, but really didn't have too much of a problem with them in line. I was ready to shoot some dude (non-tour group) in line behind us for RnR. He was saying to his companion how he had broken all of the roller coaster records in Orlando (whatever that means!) and how underneath the ENTIRE WDW property, there are tunnels and stores and restaurants for the employees. He kept going on and on and on about it. Aftewards, my kids asked me why I didn't correct him (even they knew he was full of baloney). I told them sometimes it's better to keep your mouth shut.
I'm not too surprised about the restaurants not being crowded. Normally, we do lots of TS meals but didn't this trip. I wanted to stay on vacation longer and at a deluxe resort more than I wanted to have ADR's. We used the QSDP instead. We shared lots of meals because the portions are so big. We are all sick of hamburgers and chicken strips but we did manage to have some Mexican food, ribs and pasta. I highly recommend the QSDP! Missing out on the character interaction was something I did miss, though.
Glad you had a great trip!