I attended the 9/1 party and while it felt fairly crowded to me, waits were not bad and were less than posted times. We waited until 10:00-ish to ToT and most lines were practically walk-up. We ended up with almost 15 pounds of candy between the three of us without even trying that hard.
This was my first party. Here is my advice:
Don't ToT too early; the lines get MUCH shorter later and that candy gets incredibly heavy to carry around. Of course, the waits for everything get shorter later on so I guess you have to choose what you want to do most during this sweet time.
I would honestly pass on the special treats. i love sweets but I don't eat much of them usually, so I was looking forward to indulging myself at the party. I found the waits for the treats to be long and the treats to be mediocre at best. They LOOK beautiful, but they really don't taste that great. I waited over ten minutes in line at Pecos Bill's for the worms and dirt and it was tiny, room-temperature, and kind of bleah. The Jack Skellington pop was cute but only tasted ok. The Mickey pumpkin waffles were pretty tasty but still nothing that special. I only tried one of the Haunted Mansion desserts--the raspberry one--and it was probably the best of all, but still, just not that great. I feel like they could have done much better with these. It was somewhat of a waste of time and money, not to mention caloric intake I could have used on something yummier!
I got the pumpkin popcorn bucket right at 7:00. What was I thinking?! I had to lug that thing around all night. It's cute as anything but I was super tired of dealing with it by the end of the night. Unless you just HAVE to have it and are afraid of them selling out, or you plan on eating popcorn throughout the evening, wait until the end to buy it.
That's all the advice I have. I guess everyone already knows to be careful trusting what cast members say. I was given wrong/misleading information a couple times about when an event was going to start and where things were located.
Oh, one more thing. We arrived at MK at 3:07. There was one family in front of us and we began a line. After a while, the cast members allowed the line to disperse across the various entrance tapstyles, so at that point we were first in our individual line. By around 4:40, there really weren't very many people behind us, so we didn't save ourselves much time by getting there so early, and it was brutal in the heat. We were lucky to be first because we could JUST fit in the shade of the overhang over the tapstyles, but everyone behind us was directly in the sun. I would go a little later if I did it again.
Also, right before they let people in, a line of cast members comes out and stands facing the crowd-- hands, pockets, and satchels full of wristbands, waiting to "band" guests as they enter. Once people are allowed into the party, the entry becomes VERY congested very quickly, as people stop to get their wrist bands. I don't know why they do it this way, it just got backed way up. We had trouble with my daughter's magic band not working (which cost us about 5 minutes or so, which completely negated the benefit of arriving early as party-goers swarmed past us as we waited for the issue to be resolved). As the manager-dude was on his iPad fixing the problem, I told the kids we weren't going to get our wrist bands until later, because we had a fastpass that was due to expire at 4:15.The manager-dude looked up from his iPad and said that we could get our wristbands from several locations within the park, as I'd read on these boards. But there was this other manager-lady that kept hollering at everybody entering the park to get their party wristbands. We tried to squeeze through the crowd without wristbands and she yelled "you need to get your wristbands!" and we just ignored her and kept going. If you can get through the crowd (it ain't easy) and get your band later, do it. There aren't nearly enough "banders" to keep up with the throngs of people piling in. As it turned out, when we finally emerged on the other side of the crowd, we encountered a timid-looking cast member standing on the fringes with a handful of wrist bands who looked grateful to finally find someone who didn't already have a wrist band on. Nobody else had made it that far back without getting one yet.
We had a good time, but our "plan" went straight down the drain when the rain started. It became impossible to know when anything was going to start, and we didn't want to stand around waiting for events that may or may not occur. I really wish they'd made announcements about delays and then given a warning a few minutes before things were about to begin, so people could be informed and get to where they needed to be. They did this for the fireworks but not for the parades or Hocus Pocus.
Overall, we had fun, but the rain did mess things up quite a bit. I didn't mind getting wet--that wasn't all that bad really--I just hated the disrupted schedule.