DD has been going to
MVMCP or
MNSSHP since she was 2. It has always been the highlight of our trip. She was closer to 3 than 2 on her first party night and it was MVMCP (she was scared of Halloween stuff as a toddler). I wouldn't think about trick or treating at the party at that age--- it is basically just a long line where they throw candy into your bag as you go by. I think your time would be better spent doing other things. (
Disneyland has characters on the trick or treat trails-- but unless they change something at WDW it does not). We even went to the parks during the day on party days- she would just stroller nap and did well with that.
My DD loved all the characters as a toddler/pre-schooler- that is where most of our party time was spent. Age 2, she did nap in the stroller some as it got later in the evening. I remember that we were there on an extremely crowded night when she was 2 and tried to get a spot for the first parade an hour ahead of time and could not find a good spot. We decided to give it up and do the second parade. She fell asleep in her stroller before the parade as we waited for it--- we woke her up when it got close and she got excited by it and was dancing around (again Christmas party- she would not have liked the Halloween parade at that age)- and then after it was over, she was asleep in her stroller again before we got out the gate and we watched the parade by the Emporium so that tells you how quick she was out cold. By the next year at age 3, we were dragging her off the Barnstormer at 11:45 with her screaming for one more time (don't feel sorry for her-- she had ridden it 14 times in a row without having to get off as there was no line--- I gave up after 11 and DH couldn't make it past 14).