After countless trips, we also find DHS a half day park. We do the usual: TSMM, ToT, RnR, Muppets. Maybe go see Mushu and get a photo with MM.
My biggest issue is the lack of atmosphere. The park lacks a magical vista where you can passively soak in the magic. At MK I could bench sit to people watch for a long time in various locations and feel it's worth the trip. Epcot, walking the WS is worth it for the view alone. AK, many wonderful lookouts and hidden paths. I always feel the concrete jungle is around me at DHS. I do Disney immersion style -- and DHS isn't an immersion place. I like the street performers and parade/street shows (even HSM). Long way of saying it isn't themed enough for me.
Food choices are poor too (although I like Brown Derby).
Having said all of that, when we "tour guide" family and friends, they really like it and don't have the "lame" park reaction many here do. I think the frustration may be more acutely felt by repeat guests.