Are you talking about stores or homes? Or both?
While I can't go to the extreme my sister does (she will not even THINK OR TALK about Christmas until Thanksgiving is over) I do think that "one holiday at a time" is plenty.
I was still doing back-to-school shopping and having a hard time finding the binders because of all the spider webs and candy corn that were taking over the stores. Now that I WANT the candy corn, good luck--all I can find are candy canes
In my opinion, if holiday decorations for a particular holiday come out more than 30 days before that holiday, everyone is more than sick of it by the time the holiday rolls around. Then you can hardly enjoy it before the next holiday is dragged out, way ahead of time.
One holiday at a time, please--let's savor these special days with our family and friends.