A CM told me the biggest drop on BTMRR is the same as the one on POTC. I don't know if that's true or not, but I felt like a big baby for worrying about it after I rode it. It's fast and jerky, but unless you're in the back car, you barely feel the drops. I like the back row, because your butt leaves the seat on those little drops. In comparison to Splash(which I finally rode for the first time at 41) it's a totally different kind of ride. I liked the theme of Splash, but that last drop is way too much for me.
OP--if you do well on BTMRR, you should really try Space Mountain. The drops are a little bigger, but because it's dark, they're over before you realize you're dropping. I braved EE this trip and was surprised that the drop isn't bad because it curves. SO, now I only have RnRC and ToT as rides I won't do.