My DD11 and I went for the first time last year. We collected almost 20 lbs. of candy! Of course we didn't really ride any rides. Since we have AP we were fine skipping that. We watched the first parade (I knew Pluto), watched the fireworks, and went around collecting as much candy as we could! We had a blast-we were on a mission! I brought along a back pack to put all our haul in.
This year, if we go again (hope to though we are going to WDW from 10/8 to 10/18) I want to top last year's total. I plan on getting more of the healthy snacks too-especially the Craisins. My 2.8 nephew loved them and ate them for months after.
We did the one at WDW several years ago (more like 3 or 4) and we were very disappointed in their candy selection. No name brands to speak of. The stuff we got at DLR was top notch. We gave a lot of it away on Halloween to our trick or treaters.
Perhaps you saw our pictures....
Mickey's Halloween Party candy haul 2010
The whole haul!
Close up of our haul
Just like when I was a kid, I had to bag like items together. I even weighed them.
Maybe this year I can get my Dsis to go as well and get over 30#.

I think we would need 2 backpacks! Maybe we should bring the 2.8Nephew...then we would have his stroller....hmmm......