I've been following this thread closely as our party is coming up next week. There seems to be a trend in the "very crowded" vs "it was not that crowded" posts. If you are there for the halloween specific activities (Hocus Pocus, Hallowishes) that pretty much involve Main Street, it's "very crowded." Whereas if you were there to just do the rides, it seems people report that it was not bad nor too crowded.
So I guess it depends on what your plan of attack is. Now we are not going to MNSSHP to ride rides, we will ride Haunted Mansion because well, it's perfect for MNSSHP and it's all themed up and whatnot. But we are there for the rare Meet & Greets, Hocus Pocus, Boo to You parade, Hallowishes, party merch, treats, and trick or treating for candy. I've warned DH that we have to pick what is important to us and have a strategy, but be prepared to throw plans out the window based on reality. We plan on going before 4pm with our PH tickets, do a few things, get our bag and band and line up for Jack & Sally very early. We want to minimize wasting party time. We are then shifting our focus to Main Street activities for several hours until after the fireworks. Then we will go run around doing this and that, trick or treating as we go.
I know we will probably only get to if lucky do 3 meet & greets with our current plan, but we want to do a little of it all. So if a line is too long, we will move on. Our one big is Jack & Sally. We will sacrifice hours before party time, to save actual party time.
Crazy that you have to do this, but I guess it's based on what you are willing to do to get to do more.