I'm going to Disneyworld in a few weeks and that made me think of what has been the scariest rollercoaster that I've been on. My choice is the rollercoaster at NY NY in Vegas.
What are your opinions?

This isn't a roller coaster, but the Tower of Terror is a great ride not to miss....the Rock and Roll Rollercoaster was scary to me.

The scariest roller coaster I've ever been on is the Dueling Dragons at Universal Studios in Orlando. We sat in the front row and it was the most unbelievable experience. It's the kind of roller coaster that is not enclosed underneath you and your legs are dangling free. The track is above your head. There are 2 trains going at the same time. There are points where you go head-to-head with the other train. Being in the front car makes it that much more incredible. That's why they call it Dueling Dragons. Make sure you go to Universal Studios and ride this ride. If you can, get a "Fast Pass" so you don't have to wait in line. I think we waited 1 hour and a half to ride. If the line wasn't so long we would've rode it again. You won't regret it. If you thought the roller coaster at the NY NY in Vegas was scary, this will blow you out of the water. Please tell how you like it when you get back. Haven fun!

Scariest coaster: the desperado at buffalo bill's casino in primm,nv

The Millennium Force at Cedar Point,Sandusky OH gets my vote! This is a fantastic roller coaster park,by the way.

In my opinion Disney doesn't have anything that comes close to a "scarey" coaster. Dueling Dragons at IOA is a BLAST!!

Dueling Dragons at Universal Studios is a good one (very good one) but I actually preferred The Incredible Hulk (also at Universal). Both are better than the Spiderman ride (IMHO).

Can't really compare Dueling Dragons and Hulk to Spiderman since Spiderman isn't even a roller coaster. They're ALL GREAT rides. Islands of ADventure is a fantastic park.

The Incredible Hulk at IOA scared me so badly, I wouldn't go on Dueling Dragons. But for roller coasters, don't miss Islands of Adventure even if you have to miss a day at Disney!