I have so many more of these than "one and dones"! Fun thread idea!
Magic Kingdom:
Splash Mountain
Thunder Mountain
Jungle Cruise - don't judge! I love the corny jokes and each skipper makes it just a bit different.
Space Mountain
People Mover
Epcot:
Soarin' - at least, it was before it changed. I'm assuming that won't change with the new movie, though)
Spaceship Earth - I like to pick completely different options at the end and see what my life with be like regarding health, home, and leisure (never work! Who wants to think about that on vacation?)
Living With the Land
Hollywood Studios:
Great Movie Ride
Tower of Terror
Rock n Roller Coaster - during my college program, a friend of mine and I decided we wanted to ride in every single seat starting in the front row and working our way to the back. A worker noticed us around ride number 5 and helped us out by backloading us for the remainder of the rides. So much fun!
Star Tours - well, sort of. I want to see both Darth Vader and Yoda so I will ride until I get to see each of them, no matter how many that takes.
Animal Kingdom:
Expedition Everest - though, to be fair, this is easily my husband's and my least favorite park and we spend very little time at the park.