Genie+ and ILL have significantly changed the park experience from what it was like in 2019. Even if one doesn't use the new system, and didn't use FP+, I think they would still notice that the new system has changed park goer behavior. Because so many people are now awake at 7am to book Genie+, they are getting the parks earlier.
A related change is the change to EMH. It is no longer 1am hour, but a half hour in all parks every day. With the 3hour PM option only open to Deluxe+DVC, and only 2 days/week.
A third related change is that the park hours, on the whole, appear to have been reduced (relative to crowd size). In 2019, WDW was already in the process of cutting park hours, but there is much room to expand park hours. This is something debated on these forums, so it is hard to say exactly what 'normal' park hours should be based on current crowds, but IMO, current practice still seems to be amiss relative to historic trends from just a few years ago.
It looks like WDW just announced an increase in park hours at Epcot, so maybe things are improving?