During the 80s, 90s and early 2000s, the expansion of other parks and the financial hurdles of Euro Disney meant that Florida's Magic Kingdom specifically didn't get as much attention as it could have. The big three things that the second generation of Imagineers added to the park were Splash, New Tomorrowland and Mickey's Birthdayland. Of all those things, Splash was the most complete and successful in its execution, unlike the ambitious, but unfinished, Tomorrowland redo and the half-baked Birthdayland (whose tents remain today).
Now all three of those are largely gone and all that's left of that specific era are minor things like Winnie the Pooh and Magic Carpets. Weird that's there's more WED in this park today than Eisner-era Disney. A shame because the changes to MK since the mid-late 2000s have been more miss than hit. I just hope Splash 2.0 is still aesthetically pleasing on the outside when it's done.