The passage of time and the steady diminishment of my capabilities means that even if I do nothing, my objectives gradually creep away from me.
To me, this means that each second is a vote. I can use that second to gain territory (or at least learn something in the attempt), or I can use it to enjoy what I have. Quite often, I find that I can do both at the same time.
The other option—stewing in a mess of low-level anxiety because I’ve been procrastinating—does not appeal to me.