Wow Boo Bash should be outstanding with 5k then.
It's not directly relatable. MNSSHP has other things that suck capacity besides the rides. Many people go just for the entertainment, for the character meets. So it's not 25,000 spread among the rides.
For Boo Bash, there really isn't that much to do besides the rides.
But yes, it should definitely "feel" less crowded than MNSSHP