I love many of the new things that have been done in the parks. However, there are really well more than 3 things I would love to see come back.
1) Journey Into Imagination, in it's original form. It was an amazing ride
2) Wonders of Life pavilion
3) MK nighttime parade
Those are probably my top 3, but I'd also really like to see Horizons, the AK parade, and the Epcot parade return. I'd love to see World of Motion come back as well.