Just to eat? No. But we do plan a lot of our park time around our meals. For example, on our last trip, we had dinner at 1900 Park Fare (not that great, IMO) and then spent the rest of the evening at the Magic Kingdom.
We had lunch at 9 dragons one day, so we started that day at Epcot.
As far as park hopping in general: YES. I don't believe I have spent a full day at ANY park in WDW over the 24 days (ok, not that many) I have been there. I like the variety of the different parks, and different parks are better at different times of day... I won't be caught dead in AK after about 2 o'clock.