We just got back from GKTW late last night! The trip was WONDERFUL. GKTW was amazing, although they definitely have some communication glitches to work out (I'm guessing because of all of the volunteers?). We had multiple instances of being told one thing at one point, and then being told another later. That was pretty frustrating.
Like a lot of people have said, for the most part, Universal goes out of their way to get you to the front of the lines (or as close to the front as possible). Dawson and his brother were picked for wands at Ollivanders and we were treated like royalty at each character we went to meet.
Disney doesn't quite go out of their way as much, but it was still an incredible experience. The boys LOVED Splash Mountain and the 7 Dwarfs Mine Train.
We skipped Epcot and didn't go to SeaWorld.
I'll be doing blog posts soon about the trip. We had SO much fun, and GKTW was priceless. Because of how HOT it was while we were there (I think it was a high of 90 each day last week), we left the parks by 2:00 each day (1:00 a few days), cooled down in our villa, and then swam and did nightly activities at GKTW.
We also took advantage of the carry-ins at Disney and ate almost all of our meals at GKTW. We bought go-gurt (we froze it overnight), apple slices, etc at the Wal-Mart down the road and ate those snacks around lunch time at the parks. It was so hot that the boys refused to eat much for actual meals while at the parks because they were SO hot, so those types of foods were perfect. We saved SO much money with this. We'd eat a late lunch at the villa, and then a late dinner. This allowed us to say "Yes!" to almost every souvenir request from the boys. Of course, we then had to use some of the money to buy a suitcase just to bring everything home, but it was well worth it. And we still technically have money remaining that we will put aside for Christmas.
Anyway, if you have any questions, let me know! Like I said, I will be doing a couple of blog posts about the trip eventually.