We went during last week of October last year and took family for MNNSHP - soooo worth it! If you go during the week (we went on a Tuesday), not so busy. And if you stay past 10 pm (open till midnight) you just walk onto rides, and you can walk five across through the park without a problem, especially in Frontierland. We each got loads of candy, all Nestle and such, good stuff. Make sure you go along Alice in Wonderland path from Mickey's Toontown to Tomorrowland - that's where we got the most. Also, take advantage of their free photo spots - go inside in Tomorrowland and they take a family photo by a photographer for free - there were 5 of us and we had 5 gorgeous photos waiting for us when we got home! Also, you don't have to use a park pass day to go - we went to the park around 4:30 p.m. with our party tickets and stayed until midnight (our kids are teenagers). The fireworks is also new and different for the Halloween party nights than the Wishes fireworks, and the parade is excellent. Kids or no kids, it's still very enjoyable, and the decorations are great. No costume is required either, but it's lots of fun - my DH was a pirate and had a ball saying "arrgh" all night. Buy your tickets on-line ahead of time as it's cheaper. You'll get them in the mail in plenty of time.
Enjoy!!!