I don't "get" celebrating a new year, or a birthday, or any of those sorts of things. It makes no sense to me. Why not celebrate every new month? Week? Moment?
[I am suddenly reminded of a mid-80s Randy Stonehill song/album, "Celebrate this Hearbeat" ("'coz it just might be my last").]
Perhaps this song I wrote in college will help you see why I have problems getting excited about a new year.