Parades and fireworks--pretty much all of them. I get seeing it once, but it is so overhyped and if you want to do it the "right way" you end up spending money on dessert parties, ADRs timed with fireworks, Poly CL, etc...it's not worth that.
Any ADR before 10:30 a.m. or so. We have done pre-park ADRs, and we want to see the characters and enjoy our meal, so we inevitably get out about 10-15 minutes after park opens...and that's if the park opening wasn't changed to 8 am or something anyhow. And the pre-park opening ADRs for those pictures on "empty" main street. It's not empty anyhow and you miss the rope drop show and you either have to rush your meal or get into the park late.
Most Disney food. I love Dole Whip floats and Mickey caramel apples, but really everything else that is raved about is just good, not amazing.