I'll have a real post up in the next couple of days, but please go read this post by John Scalzi. I thought about doing my own list, but since in so many ways John Scalzi and I are similar in what we don't have to think about, just go read what he wrote. Also a bonus is that many of the comments are excellent, too.
The only one I would add is the following.
I don't have to think about how to keep a roof over my head or my family's head or how to feed myself or my family when my current job ends,
but today I will.