Yes we LOVED the GF at christmas time it was awesome (despite our 48 hr stomach flu) we had a great time. We went with my mom and my inlaws and everyone fell in love with the GF all decorated. Plus there are character meals there so easy to get to. We have small kids so we find the monorail resorts a must. We just got back from the GF, we went in April our 2nd trip in 6 months to GF and still love it.
We are choosing the Poly this time because my DD loves that resort also and it is a little less expensive (not by much though).
You will love the GF in Dec.