Well, yes, one might think it's a wasted day off, but if you look at it another way, you're lucky because you had a day off to do necessary and important things as a grown-up. When we're little, we want to grow up, but that's when we don't imagine all the boring and sometimes complicated things adults have to do. But there are many interesting things in your day, you are very organized, and in a short time you have been able to check off a lot of pending tasks, and I suppose you were able to finish everything by the end of the day.
It's nice that you can differentiate between what is necessary and what is important, like spending quality time with your girlfriend. I hope that those important things were also checked off your list at the end of the day.
I am the worst at organizing my time, and many times I fail because I can't do everything I need to do and have planned in a very short time.