While you are technically correct (it's just another day), it nevertheless is the date when most people take some time to look back and to think what needs to be changed. So for those it's more than just another day.
And (at least in Germany) New Years Day is the end of the celebration-time, starting around Christmas. With much great food and more alcohol than in regular times. Thus for me "getting back in shape" is the first goal in this year. Especially as the whole family plans to participate in this event (german only).Happy New Year to all of you! Rata