DH and went yesterday, and arrived at 8:30AM. They just started letting people in (30 minutes early), and we followed the crowd straight to WWOHP. Jumped in the line for FJ, got on in about 30 minutes. Next, we did the little coaster, waited about 10 minutes. Then we waiting for Olivander's for about an hour, but we were okay with that. After that, we headed for Dueling Dragons, and walked on that. Had lunch at Three Broomsticks, and it took about 20 minutes to get in, order, and get a table.
Then we went over to US for a while and came back to IOA around 9-ish. FJ was at 20 minutes, and everything was much less crowded than earlier in the day.
For our first Universal Studios/IOA experience, we were very pleased. We thought the crowds were no where near as bad as we had read, and we were able to do just about everything we wanted. Plus, we couldn't have asked for better weather! Simply gorgeous!
Of course, I doubt the day would have been as smooth if we hadn't gotten there at RD. So, if anyone is ever curious about future crowds the day after Thanksgiving, we had no problems at all.