Back when I worked outside of the home, I definitely took vacation days from time to time and still sent my child to daycare. It's a great opportunity to catch up on house work and yes get Christmas shopping done more efficiently! Besides, we all need a break sometimes, even from our own babies. I don't mind it at all, as I've been there!
That being said, i did used to drop my child off at 9 and pick them up by 3:30 on those days, but to each their own and some like to keep a consistent routine and get the most of their day off. As long as their child is healthy and happy, he/she is welcome to come for their paid day as that is what I'm there for.