The Tarzan show at AK is also very loud. It's like a mini rock concert and the volume seems to be very loud. The Tiki Room at is pretty loud too. Lots of thunder and explosion effects are a part of that show.
Some other potentionally frigtening shows include Little Mermaid at MGM (An appearence by Ursula the Seawitch, who is so large that practically fills up the whole stage, makes many kids squirm), It's Tough to Be A Bug (A frightening realistic animatronic Hopper from "A Bug's Life" as well as effects that make you think that you are being stung, swatted, and sprayed), and Fantasmic (Malificent, Jafar, the Evil Queen, and many other Disney Villains make appearences in this show that can frighten small children).