Whenever I pack my bag in the morning, even if I have 4-5 hours before I leave, I forget something. The phone, the wallet, the cash I plan to carry in the wallet, the keys, the pencil case, the books... I just have to make it the night before. And generalising this and what you say, simply preparing for the day ahead is a very very useful thing. Maybe for a certain type of people though, because I've known some of those people which just remember the things when they need to, without any effort nor any notes.