I absolutely agree, even though what other people do is absolutely none of my business whatsoever. That said, I do like to see other people's trees in windows and outside displays, so the sooner they rip them down, the more disappointing it is.
I don't understand why people put decorations up in October. There are other occasions to celebrate before Christmas, there's plenty of entertainment, and it's mild and not too grey outside. On the other hand, there's not much to do January / February, and it's often too cold and bleak to want to. That's when I could do with the lights and the shiny things, personally.
I read about Candlemas a couple of days ago. For various reasons, my decorations were done almost literally last minute this year (finished 23:55 Christmas Eve), so I've decided I'm going to leave them up for Candlemas and take them down Feb 3rd. Then, at least, spring feels closer. Also happens to be my birthday during that period, and I wouldn't mind some fairy lights at all.
Disclaimer: I live on my own, so what happens in my household is entirely up to me.