Here's what to expect:
If you've seen the
youtube videos you know what happens, but not how it "feels". Here's how it "feels" from a fellow ride-chicken.
The roller coaster is very smooth, not jerky at all, so that's a good thing. The ride starts off on the ground level and it's faster than I thought but it's fine. I think you go up one small lift hill at the beginning.
Then you start the long trek up the mountain. This is where the anxiety really gets you. Your heart starts racing, you feel like you gotta pee, etc. But if you take a look around it's really quite enjoyable. The lake down below looks awesome, I believe you can see hollywood studios and Epcot, you can see some buildings off to the left and I think one is ToT but I could be wrong. Then you get to the top and the ride kinda curves left to where the track "ends".
The next part is the worst part of the entire ride. Going backwards. You think you're prepared for it, you know it's coming, but it's horrible. All of a sudden you start going backward and it starts to pick up speed, then it makes this huge turn and then you go "up". It's a very disorienting feeling as it's the opposite of how most coasters feel. Going uphill backwards is a very weird feeling.
Then comes my favorite part which is the yeti projection. The rest of the ride is fine. The steep hill is nothing. It's over very fast and there is a large turn up which counteracts your dropping feeling so it ends up being a nothing feeling. Splash Mountain's drop is much worse than EE's drop. There are some twists and turns and the ride does go fast, but it's smooth and the g forces aren't much worse than Thunder Mountain's turns.
So my advice is to do it, but just realize the 15 seconds you go backwards will be really bad and you'll probably hate it.
I hate the backwards part, but the rest of the ride is so enjoyable that I go on it repeatedly and just "get through" the backwards section.