I like hopping, the rest of the family doesn't.
I like to hit one park in the morning, leave mid-afternoon for a break (nap, pool, etc), then return to a different park in the evening. I did this when I went solo last year and liked the flexibility and the chance to rejuvenate for the evening. One evening I went to MK but found it too crowded, so just went over to Epcot as I'd been to HS that morning.
The rest of the family likes to spend all day at one park, and thinks taking a break is a waste of time, as is travel time to another park. The exception is AK, which we've usually finished by mid-afternoon so a hopper allows to visit another park afterward.