I have dubbed my notetaking experiment 'Project Exobrain' for a reason! Once someone explained to me that the purpose of a task manager is relieve your brain of having to continuously, ineffectively, faultily remember a dozen tasks, I was sold.
The post-it idea is interesting... there's a professional poker player who wrote his 10 biggest, life-fulfilling goals on a paper when he was in college and stuck it to his bathroom mirror. He found the daily reminder of the bigger picture a huge motivator, and crossed off the 10th item in only ten years or something like that. It sounds kinda cheesy, but I can see how it can be useful to some.
It wouldn't work for me. Usually, it takes me at least until I've had my breakfast before I feel awake. And if I had reminders when I'm going to sleep, I wouldn't be able to sleep because my brain loves overthinking things more than sleep.