Do you try to keep all of your to do items in your head?
I have heard that this is not what our brains were meant to capture, but our brains sure do a good job of trying. How many times have you lain awake pondering that list and what needs to be on it?
But getting it down in a manageable way, out of our heads and onto paper or an electronic system, is a gift to give ourselves. Your ideal system may be different than mine.