I have a problem with working off my todo list (which is a canonical GTD next-action list in digital form.)
The problem is that I never remember to look at the list for determining what to do next. I just pick anything that I recall I have to do, and do it, or stoop into procrastination. Small, 'miscellaneous' items get forgotten and not done.
It still helps to have a next action list as I will look at it during my review, but I know that I get tremendous amounts of work done when tightly focused on the next action list, and want to spend more time in that mode.
So what scaffolding can you put in place to build the habit of looking at your todo list when you decide what to do next? (and maybe actually noticing that you do need to decide that, rather than going with the flow of the urgent and the mundane?)