I was born in 2001, lol. I just happen to envision the ideal Disneyland as one in which there are no IP-based attractions outside of Fantasyland's traditional animated film fare. There's an unmatched charm to be found in IP-free Disney theming, which was 100% prevalent throughout almost the entirety of either of the American parks until the eighties and nineties, when the very first modern, non-Fantasyland IP attractions creeped in. The original lands were built around timeless locations and featured timeless adventures and scenery, for the most part at least. The only exception was of course Tomorrowland, but even then, the concept of the future is very broad and holds the potential for so many unique and creative experiences, which Disney in the Iger era has clearly preferred to waste on Buzz Lightyear, Stitch, and Monsters Inc.
Modern themed sections in Disney parks are based solely around popular franchises (essentially slowly-fleeting fads that eventually nobody will care about) which provide no room for original, unfamiliar experiences. Furthermore, IP attractions that are added to the traditional, broadly-themed lands diminish the aesthetic and thematic value of those areas, as instead of being immersed in a whimsical and believable place the whole way through, you are faced at some point with an anachronistic icon of popular culture where there should be something timeless and far less meatheaded.
Attractions such as the Haunted Mansion, Pirates, and Space Mountain are iconic works of creative genius and have defined Disney parks for many decades. The Imagineers had unique visions and went all out with them, creating original experiences that newcomers can never truly anticipate. Original attractions like those would ever be allowed today, of course, as they aren't arbitrarily tied to a familiar property, despite the fact that they have proven to be the most beloved theme park attractions of all time, and that it's nearly impossible to imagine the state of Disney parks without them.
We have at least gotten occasional glimpses of modern-era original attractions, such as Mystic Manor, but they are few and far in between.