It has nothing to do with sleeping in or being lazy. We sometimes choose to go to a water park or swim at the resort pool (or do something else that's fun for us), then go to a theme park in the afternoon. It was nice when we could schedule FP+ rides later in the day. A few each day were okay for us - we don't need to "keep riding more rides," but we did like being guaranteed that we could ride the ones we wanted when we wanted. Genie+ is a big step down for us.
I enjoy non-park days as much (if not more) than my park days.