Universal Studios
Revenge of the Mummy - it's a mix of a dark ride and a roller coaster. It's a fun ride - I love the coaster part. They take your picture on this ride.
E.T. Adventure - I like this ride for the nostalgia. I first rode it when I was younger, and it makes me think of the early 90s. It's a good family ride, and there is something fun at the end!
Islands of Adventure
The Amazing Adventures of Spider-Man: LOVE this ride. It incorporates 3D and neat effects. This is a must-see at IOA!
Harry Potter and the Forbidden Journey: This is a very neat and intense ride. It involves a simulator ride plus you see a lot of other neat animatronics. A little hard to describe, as people have mentioned. One thing I want to add, from what I have read on here, is that some people tend to get motion sick on this ride. Even people who usually don't get motion sickness. Or on the flip side, some people who are prone to motion sickness end up doing okay on it. Just a little heads-up.
Here is a recent thread that discusses it. They take your picture on this ride.
The Incredible Hulk Coaster: love this roller coaster! I don't know if you have been to WDW, but I think it's comparable to Rock 'n' Roller Coaster at DHS. The launch at the beginning of the ride is fun, and I didn't seem to feel any major drops on it. It looks (and sounds) scary when you are walking around it at the park, but it really isn't as scary as it looks/sounds. Very smooth. After you get off, you might feel a bit light-headed - but it is a great ride! They take your picture on this ride.