You know, we always take the option to hop, but we almost never use it. We have 3 kids, and for them, one park a day seems to be about right. We usually go from opening to dinnertime and then head back to the resort to crash/swim/experience comalike Mickey bliss.
There have been a few instances where we bailed on a park after lunchtime instead, and then went back to that same park at night to see the fireworks/nightime parades/shows. Maybe when they get older we'll hop more - I think it varies by family ages/personalities.