Disney Imagineers have a tendency to tinker with their rides to try and "improve" the experience. From what I've seen, this has been a hit-or-miss deal, with some attractions actually better, but others should simply have been left alone. What makes your list of ones (still active) that shouldn't have been touched? Here's mine:
Journey Into Imagination (should have stuck with the original)
Test Track (don't care for Tron Track)
Universe of Energy (don't care for Ellen Degeneres)
Spaceship Earth (should have kept Jeremy Irons' narration, Tomorrow's Child, etc)
TTA (hate the current spiel, always liked the "now approaching....." voice-over)
Great Movie Ride (I much prefer the original pre-show film, original narration, and original end film)
Journey Into Imagination (should have stuck with the original)
Test Track (don't care for Tron Track)
Universe of Energy (don't care for Ellen Degeneres)
Spaceship Earth (should have kept Jeremy Irons' narration, Tomorrow's Child, etc)
TTA (hate the current spiel, always liked the "now approaching....." voice-over)
Great Movie Ride (I much prefer the original pre-show film, original narration, and original end film)