Soarin’. The original Soarin’ over California is THE best attraction soundtrack ever. But my nomination will cover both the original and new version for simplicity.
Grim Grinning Ghosts is only a portion (but a great song) of the whole soundtrack for HM. I like the whole attraction soundtrack for the way it builds from the start (slow, ominous organ notes) to the frenzy of the graveyard scene (with the song) and then settles down to return you to the beginning sounds. The soundtrack makes me feel like I really went through an experience - and survived the HM.
Haunted Mansion
it’s a small world (not a popular choice, I know …but it makes me happy)
Carousel of Progress
Pirates of the Caribbean
Enchanted Tiki Room
It is actually the name of the entire ride soundtrack. The chord progression at the very start of the ride is actually identical to the graveyard where they are singing it.