It's true. BatB will be packed. IdF will play for near empty theaters. (Disregarding the drunks who really just need to sit down a bit, i.e., half the theater)
It could be the reverse if EPCOT had been properly developed. If WDW had been differently developed. But as it stands, after by now 25 years of forever aiming lower at the cultural ladder the audience that would appreciate IdF I think is no longer even aware EPCOT exists. While the MK hordes will descend upon EPCOT like stampeding woldebeest and use it as their overflow park.
WDW guests expect a toon singalong, plus alcohol to sedate daddy. Nobody expects a visual tone poem in a remarkably sophisticated treasure trove of architecture and design. Both the parks and the audience have changed from the latter to the former, in an mutual race to the bottom. They both drag each other down.