I have never been to WDW when I didn't hop. I do go in off peak times, so many parks close early, except Epcot. We usually stay at an Epcot resort, so tend to spend our evenings there, regardless of what park we went to earlier in the day. It's not unusual for MK and MGM to close by 7 or 7:30, but Epcot always stays open till 9.
Also, I like the variety of park hopping. We are AP holders, so we have never had to think about whether or not to hop.