I would say the weekend before thanksgiving, the 1st weekend the holiday decoration go up might be less crowded if that's what ur worried about. I went the 1st weekend of the holidays and It was good. Also went the 1st and 2nd Saturday of December and it was way too crowded for my liking. Either way just plan your days and you'll have fun :)
My bf gets the best reception on Sprint 4G by toy story mania. I have at&t & web reception sucks everywhere. Downtown Disney is the only place were i don't have too much problem posting. Early mornings are good time to post and on the tram. Crowded days are just horrible for at&t.