I bought my ticket today and am pretty sure there are at least a few more folks here doing it. I have done MNSSHP before but never on Halloween night, and I'm staying at Poly so it'll be easy to get back to the resort when I decide to leave. I never sleep well before the 5K and it's the only race I'm doing, so why not, right? (I'm hoping to get into one of the dessert parties, too.)
If you are into Halloween at all, it is worth doing once. The characters, fireworks, stage show and parade are all fantastic -- and I am not normally a fireworks/show/parade person at all.