Belated Happy Birthday, snigs! I sympathise :mine's on January 5th,and that's bad enough !. Apart from the "dual present" thing what always got to me was that the Christmas decorations are still up, the birthday cards are hidden in the Christmas ones, and the atmosphere is of a lot of tired, bored people who have been exhausted by Christmas and New Year and who really can't face another celebration. (And they haven't got any spare cash for a present either! ) It's never quite your own day.
Still, as the old joke has it, Christ himself never got a Christmas present ! He had to make do with his birthday presents.