I can't believe no one has posted any yet. I tend not to shoot a lot of fireworks at WDW because its not my thing. I don't have the patience to set up as far in advance as it requires, we're the scramble for a place to watch at the last minute kind of people. And there's always so much great work here on the disboards of the shows to enjoy that I'm never worried about not being able to see great shots later.
I didn't see a lot of tripods setup at MK on the 3rd. There was a guy set up near the flagpole with 2 cameras, sitting on a ladder so his shot was above the crowd, but that was the only one I saw. Though we ended up behind the castle by the time the show started so there could have been others set up down Main Street. I didn't see anyone setup on the 4th at Epcot and we were in a good location in Japan but again, in those massive crowds I could have missed those who were setup. It was also raining on and off both days and I wonder if that kept more people from setting up.