Ideally though....if Genie is what it hopes to be- there should be enough for everyone to do.
Technically, the problem isn't the quantity of things to do, but the differential demand of the offerings.
We can EASILY go on 'attractions' all day and NEVER wait more than 20minutes for any of them, we just have to choose wisely, and avoid the ones with long lines.
I have happily spent many full days in Epcot, where my group didn't do any of the FP attractions at all. AK also has many things to do that aren't FP attractions. One can happily fill a good chunk of a park day: looking at animals, listening to performers, eating, watching parades, checking out all the details of Pandora/gardens of Epcot, etc.
Another option that only partly includes going on rides is hunting for hidden Mickeys. Sampling foods/beverages is another option. During the Epcot art festival, there are quite a few non-ride things to do/see, if one is interested in seeing the festival offerings. Truly, the Epcot festivals are one of the best ideas Disney has had.