I was in Orlando from 3/9 to 11/9.
We went to Island of Adventure on the Tuesday at 9am. Went straight from the entrance to WWoHP and straight onto the Duelling Dragons ride. There was no queue whatsoever. After that we went straight over to the Forbidden Journey. I thought the queue was quite long but it only took 20/30 minutes to get onto the ride. We did go back to WWoHP later in the day and the queue was stupidly long. However there was a bit of confusion over which line to get in as people were queuing for the lockers when they didn't need to, and people were going straight onto the ride when they needed a locker.
You will probably be fine with the early tickets. Head straight there and you'll have little waiting time. As for the rest of the park, I didn't queue for any longer than 10 minutes for anything else. Which was slightly annoying after paying for the express tickets.
Oh btw, without revealing too much, the Forbidden Journey has some stunning features even before you get on the ride. I'm not a fan of Harry Potter by any stretch, but was absolutely amazed at the amount of detail they've gone into and the realism of it all.