Christmas is alive and well in most metro areas. So is Hannukah, and in smaller versions, Solstice and Kwanza (the latter is a fake holiday IMO, sorry).
The point for me is this - it's a time of year when families and friends gather. Hell, even people you don't really like gather (holiday parties).
As someone with a toe in and most of a foot out, it's a pretty shitty time of the year, honestly.
I start feeling lonely around Halloween, round the bend at New Years, and it's not until I make a token appearance at the Memorial that the new year really begins for me.