You get more done and have more energy even at the end of the day if you live by a schedule. A realistic one that is not inflexible in the light of unexpected events, but one that you take seriously. This was easier when employment imposed certain non-negotiable requirements. The older you get, the more you have to be self-disciplined. You are not the kind of person who enjoys retirement as a kind of extended vacation.
Looking at a list of the things you want to get done on a day and then playing five games of Free Cell while you decide which one to tackle first saps your energy, interferes with your ability to think critically, and doesn’t help you decide anyway.
A schedule is not the same thing as a list of things to do. You get more done if you set time limits for yourself.