The skyway closed in WDW in 1999. A CM was injured and there were problems with guests throwing things over, and there were problems with it frequently needing to stop because of thunderstorms/high winds.
For info on the Disneyland problems and closure,
click here
Since the closure at WDW, the Fantasyland station has been mainly stroller parking while the Tomorrowland one remained completely empty (though they've kept the waterfall going.) You pass it on TTA. I've heard that the revamp to the Fantasyland one are in connection with the changes in it's a small world which will be flipping the entrence and exits as well as providing a new stroller area to limit the horrible congestion you get between it and Peter Pan. I'm not sure exactly how or what they're doing, but that's what I've read.
-m
edit: Here's a photo of the Tomorrowland station in it's very sadly empty state