For the list-makers, the note-takers, the Post-It note pilots, the track-keepers, and the dabbling doodlers. Bullet journal is for those who feel there are few platforms as powerful as the blank paper page.
I think better with a pen in my hand. Maybe you do too.
This "bullet journal" method of keeping a calendar looks fascinating. I don't think it's for me -- but it may be for you.