Make no mistake, it is not
MNSSHP-level crowded. But it is sort of MNSSHP-lite, if you will... as guests are encouraged to dress up, there is villainous music throughout the park, stage shows, etc. It’s more of a “party” vs just plain ol’ MK that you get with regular DAH.
Generally speaking ride wait times (except for the two overlays) are still going to be lower than regular park hours, but it’s not really the mostly walk-on / empty park feeling that tends to happen at many (but not all) regular DAH nights.