New member here! I remember the boat ride at Luxor. Never did get to go on it, but I wanted to. Also loved Speed the Ride. And anyone remember the High Roller that used to be atop Stratosphere (that many people still mistakenly think is still there)?
Of current attractions, while it's more of a tour, I did love Zac Braff's Haunted Museum. Even if not a believer (I'm personally not), the collection of artifacts are amazing!
And while I obviously had low expectations, Fear: The Walking Dead attraction downtown was actually better than I thought. Too much time is spent "scanning", and the maze portion is woefully short, but the shooting portion is pretty fun. Imagine Iron Reef with desert zombies, and you get the idea. Again, go in with low expectations (and try to find a discount... it wouldn't be worth full price).