The original plans for Disney's shopping area included a Peoplemover line (same for EPCOT.) If they had gone ahead and built them, some future issues wouldn't have come up, like the whole disjointed way Pleasure Island was free in some sections but not a section in the middle, causing walking issues for guests.
I also really wish Animal Kingdom had a transportation system - too bad the Discovery River Boats didn't have remotely enough capacity or interesting things to see.
I went to Animal Kingdom this morning, one last time before my AP expires. If Dinosaur had been a 5-10 min wait, I might have paid a visit, but that queue was at 40 min this morning. I feel for all of those guests who not only paid Disney premium prices for a premium product, to have to wait that long to see the current condition that the ride is in. We keep getting surveys asking why we're unsure of renewing...have the people writing these surveys actually been to the parks recently?