Sorry, but I think the MK's park hours are a better indicator of crowd levels than any book!! Perhaps at 2 AM, it'll be a "3" but at 11 PM, it sounds like a "10" to me
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We go 4-5 times a year, and so far the ug had been right there for us. While sometimes during the day, I expect big crowds, I don't think it will be beyond what's indicated. I never find it a 10 at 11 PM, except on actual holidays (although the crowd going out after fireworks sometimes feels like it..the rides that late at night seldom have long lines..and we're usually there until it closes). In fact I seldom find it a 10 even at 3 pm, except on the holidays. Your dates still have play room ..don't count overwhelming crowds out yet LOL. Of course, we go so often, that if a line is too long, we'll skip it. We'll be back in May.
The thing that surprised me, is how easy it was to get PS's for 9 people.