Obviously can't skip MK, and AK has the new Avatar Land and night time shows to experience. EP has the various Christmas celebrations for the different countries, candle light processional. Hence points towards HS to skip, like the others have stated.
Of course theres no Osborne's Lights. I'm not sure they're doing again but they had a Christmas comedy skit show at one of the theaters. It was awesome. There's giant Christmas trees at the entrances of Ea park. personally, HS is tough for me to skip because Toy Story is my fav, and Tower is up there. But yes, there is less to do there with construction. But maybe you could park hop and go there for a partial day. we often only went in to HS in am, then EP and mk as residents going on a Sat.