What's really missing from 1986-1991 that we have now?
Tiana's? A short TRON coaster? The Magic Carpet spinner? That's not enough to tip the scales for me.
Mission to Mars wasn't anything special, but it's better than vacant space.
I don't spend much time looking through MK stores now. I don't go into The Diamond Horseshoe. I don't care for the current version of Country Bears. Snow White is a meet 'n greet. The Frontierland arcade a DVC lounge. I don't have any interest in sitting through Laugh Floor again, but would enjoy watching Circle-Vision movies in that space.
Two rides exists where 20,000 Leagues is now, but they have the same run time combined.
The park is finally getting it's first new night time parade in almost 35 years, but there was one back then too.