planning, todo list, done list, 7 habits, GTD, <insert famous workflow process> ... what gave you a good enough system to decide how should I spend my time ?
Can't speak for others but I generally don't keep a todo list most of the time. I might keep a brief list of stuff so I don't forget but I don't waste time making a list or anything of that sort. Those things just pile on, at least for me. Instead I spend time on the things I want/need to do. If you want to be more productive, make the conscious decision to work on something that is productive or learning something that helps you being productive. Not sure if this answer is helpful.