I used to love DreamFlight. I loved the forced perspective dioramas. It's kind of bittersweet now to ride Space Ranger Spin and go through the "jet engine" effect... it's nice that part of DreamFlight remains, but it reminds me that the best parts are on the scrap heap. But I really like Buzz so that makes it easier, unlike the lame Pooh area that replace 20,000 LEAGUES UNDER THE SEA... scrapped for a little playground, seriously?! I really liked the skyway, too. But I understand why that had to go. I spent a couple of summers as a security guard at Six Flags and those buckets were a constant source of strife: spitting, dropping stuff, shouting improprieties, drugs, sex, you name it. That one ride occupied about 5 guards' time.
At Epcot, I still mourn the loss of both World of Motion and Horizons. If nothing else they should have kept the post-show area of WoM, it was way better than what they have at TestTrack. If they were going to replace pavilions with rides why wouldn't they start with Wonders of Life? Oh, and the EPCOT Outreach resource center with all their technology related handouts... I loved that place!
But those are gone forever. The one thing I miss that they could, should, and really must bring back are happy CM's who love their jobs and cherish the Disney legacy.