I also love GC!! I stayed there for 4 days about a month ago and absolutely loved it. I have also stayed at DLH, and although I liked it, I didn't feel like I HAD to stay there again, like I did with GC. It's hard to describe, but I really felt like GC was truly a "Disney" resort, almost like I felt with all of the WDW resorts I've stayed in.
It is expensive, but I felt it was worth it. The rooms are beautiful, as are the amenities, and the theme-park view was amazing. There are also nice touches such as robes to use during your stay and turndown service. I was very absorbed in the atmosphere there. The hotel and grounds are absolutely gorgeous. We had breakfast and dinner at Storyteller's Cafe and enjoyed everything about both meals there: food, service, decent price, etc.
As the above poster mentioned, it is also extremely convenient to everything, DCA, DD, and DL. Of course, all of the hotels in the area are convenient and walking distance, but GC is probably the most convenient you can get.