I haven't been to it, but last year the reviews were quite scary (and that wasn't necessarily the costumes!). I think there were huge crowds and queues for things. I think now they've stopped
MNSSHP and the Terror Nights at the Studios, it makes it busier than ever. I know they have a limit on ticket numbers but I still think it will be very, very busy.
I asked about it when I was thinking of booking and the feedback I got back told me 'no' really. So, we are skipping it tbh. At 9 and 6 I don't think my children need to be at it. They'll be happy enough dressed up and being there during the day/the next day and having dinner at Cafe Mickey on the evening (although I don't rate it that much, but the kids love it!

).
HTH