Was there Thursday and Friday (Oct. 21 and 22). Arrived Thursday into WWOHP at 5pm. There was a crowd, but manageable. Line in Hogs Head was short (butterbeer cart, as expected, was long). Around 6pm, we decided to go ahead and ride FJ. Wait time showed 30 min (probably waited around 15 min). Que went rather quickly, just having a few stops along the way. Did child swap. FJ was
AMAZING! After getting out of Filches around 6:45, wwohp was almost empty. Went into Honeydukes (not crowded

). IOA closed at 7pm.
Friday, did early entry. Got to IOA around 8:20am (being that we are not morning people, that was pretty impressive for us

)- offsite guests were already lining up. Entered Wwhop and there was already a crowd. Went straight to Ollivanders. I think we waited around 45 min. Show was cute. While in line, wwohp was getting really crowded. When we got out of Dervish and Banges (connects with the Owl Post), the land was packed. There were lines to get into Dervish and Banges and Honeydukes/ Zonkos. Around 10 we were in line for Flight of the Hippogriff. Wait time said 25 min.. Since we stayed onsite (RPR) did express and we waited 23min- lol. DC wait time was 10 and with express it was almost a walk on. We finally left WWOHP at 12:15. Got to Mythos- was told wait time was 40 min., showed are room key and our wait time was cut to 20 min. Even after leaving mythos when we were leaving to go to the studios side, Lost continent and Suessland had a large crowd.
ETA: Left the studios side at closing (5pm). Went back to WWohp. While heading over there, there were a lot of people leaving and we were thinking good, maybe the crowd is finally going down. WRONG! We walked in and it was still packed and the lines for the shops were still there! lol. Went to Hog's Head to get a refill except this time we got the frozen butterbeer. There was a wait, but nothing as compared to the long line outside. It was almost 6 and decided to go ahead and eat at the Three Broomsticks (5 min wait). After dinner we walked around wwohp and the line for Honeydukes/Zonkos was longer. For FJ, the wait was 60 min. We walked around a little bit more and then around 7:15, we decided to just do the single rider line at FJ. I asked the TM at the front if we could do child swap in the single rider line and she said yes.

Single rider was just a 10 min. wait.

When we got out, it was around 7:45 and there was still a crowd. After DH looked at the wand cart outside by the castle, it was 8 and IOA was closing. They were having a private event in Hogsmeade so we couldn't walk through there to leave and they had us leave through the Jurassic Park side.
I'm assuming the large crowd were due to HHN, and mostly fall break. Oh and on Friday, we saw many tour groups.