… it is not the tools that make people productive or not. It is the discipline.
I think anyone who tries improving the productivity by starting with a tool and filling it up with many items / tasks will not succeed. You need to start with the discipline of working hard to keep removing things from a to-do list. And adding anything that needs to be taken care of. I know this may not be very comforting to many of you, as there really is no silver bullet. To get to the destination which is far away, stop dreaming of a teleporting device or calculating how long it will take you to get there. Just start walking. You will be closer with every step.