What Eisner shared with Walt Disney was a desire (ego) to be 'the best'. Eisner's great difference was that he was more focused on making money, willing to cut corners and hurry projects to make that buck.
Eisner gave us Disney-MGM Studios, Disney's Animal Kingdom, Typhoon Lagoon, Blizzard Beach, Pleasure Island, numerous attractions, Moderate & Value Resorts, and more. Eisner transformed WDW from 2 theme parks into a complete vacation destination.
In 9 years, Iger has given us Toy Story Mania and the New Fantasyland.
Iger took Eisner's willingness to cut corners in order to make a buck and turned it into WDW's mantra.
In many people's opinion, WDW is worse today than it was in 2005, Eisner's last year.
Iger has been CEO for 9 years. Iger has taken an ax to Disney's Parks & Resorts capex budget, with the lowest P&R investments vs. P&R revenue ratio of any Disney CEO.
I don't see anyone rushing to clean up "Eisner's mess" in Orlando.
There always seem to be two Eisners, before and after 1994. Eisner's first decade was by and large positive, the second disastrous. Did the death of Wells mean all the difference?
For WDW too there seems to be a clear dividing line in 94. After 94, nearly every decision was cheap, uninspired, or even ridiculous. The EPCOTalypse started. (Why do people decry the destruction of Horizons and World of Motion for thrill rides, and Imagination and Energy for the stupid version of theirselves, while singing the praise of Eisner?). The MK was turned into toddler toon town. DAK was hopelessly underbuild. The WDW property was misdeveloped like a random suburban space anywhere else in Florida (so much for a project that started as America's largest urban experiment!). Worst of all, in an act of infamy exemplary for Eisner post-94, the Empress Lilly was sold for scraps and turned into a seafood restaurant you find in any suburban mall!
Iger's first and largest priorities to clean up Eisner's mess were elsewhere, from fixing the DL resort to rebuilding Disney into Hollywood's most phenomenal movie studio to buying Pixar because Eisner slept while everybody else moved on and found himself without a proper cgi animation studio.
As for WDW, yes, you're right, it feels a bit like the forgotten stepchild compared to the massive efforts undertaken elsewhere. But the MK is recently heavily invested in. Cleaning up Eisner's ripping out of 20k for a kiddie playground is expensive! DAK is following suit, finally being turned into a real park. The rank mess that was made of the Lake Buena Vista area - turned by Eisner from an elegant lakeside shopping and dining area to a crass ghetto strip - is being tackled in one large all-encompassing program. Eisner plain East-Germanificated WDW, leaving large ruins and unfinished projects everywhere, such as River Country, the Pop resort, Discovery Island, and dead spaces within the parks. Many of whom have been cleaned up now, for example with the AoA and the removal of the Skyway ruins that were left in plain sight. DHS, left in a deplorable identity crisis by Eisner, will see a large investment sooner rather than later.
What Iger hasn't been able to clean up, nor seems particularly interested in, is Eisner's transformation of Disney from a mid-sized quality based creative enterprise to a cynical, mean and a sorry money grabbing machine. But at least he gives you a quality experience in return, Cars Land and Tangled instead of Tiki: Under New Management and Cinderella II: Dreams Come True.