So my question is how bad of a day in terms of lines and general annoyance due to lots of kids is it on Math and Science Day? Sorry if I missed a similar thread, but I did look.

Granted the weather was terrible, but I went Friday and it didn't seem so bad. Plus, I think it's a great thing that kids are seeing the math and science involved with KI. There's actually a lot you can learn from the place.

Indeed there is. I wish there had been Math and Science days when I was a kid. I'd have gone and been studying the cultural enthnography of the place--which would have been Coney Island or Camden Park (and probably gotten into a little trouble over it!). I was always told my aptitude was in math and science, but doggedly pursued that which I love, as opposed to that at which I excelled. As one wise sage said, do what you love and you will never feel like you are working.

No doubt, there is stuff to learn at KI. I was unfortunate that my class's trip was to Kentucky Kingdom to learn such things. Nothing against the idea of Math & Science Day, I just don't want to be there if it's going to make me wait in line longer when I could go another day in 2 weeks. But if the difference isn't huge, I'm excited to visit and would go sooner.