It shouldn’t take ten years to add a new ride to a theme park. It shouldn’t take twenty to replace a few stage shows. It shouldn’t take thirty to get the park to just under double digits of rides.
I also don’t know what ‘rushed projects’ you refer to. Avatar? Because that opened this year, with the first rides to open in Animal Kingdom in 11 years. Rivers of Light? Consistently delayed throughout development. Mine Train? Added last minute and certainly not done in a rush. Oh, maybe Not Maelstrom Ever After, but that’s A) not entirely new and B) still the first new ride in Epcot after a decade of nothing.
Disney was not rushing anything, considering they didn’t open a single ride in four theme parks from the summer of 2008 to the very end of 2012. And the two rides that bookend that era were clones from Disneyland.