Yeah, I'm that guy. That guy that has Post-It notes scattered all over his monitor and desk, of all different colors. I'll grab a piece, jot down a note, only to complete the task minutes later and throw away the note. I'll think of something when I get a glass of water at 2AM, jot it down on my work desk, and go back to bed.
Since I can make these notes so quickly, and I'm so obsessive about it, it really boosts my productivity. I don't forget things nearly as often, and frankly, I have about 1,000 things to remember at any given time, so that says a lot. My note-taking has helped me amplify my multi-tasking and prioritizing abilities, too.