There's a difference between LP (or TDD or ...) working to help you improve your programming and get over hurdles versus a metronome. A metronome is a practice aid, when you perform you will generally not use it (though in an ensemble,
someone or some group is often playing the part of the metronome in establishing the beat). With LP and other techniques they are not
practice aids (or not
just practice aids) but
performance approaches. Now, you may not use them all the time, you may not find them
generally applicable, but that doesn't mean that you should skip it if it gets the job done.
In this case, the more you use it the more natural it will become for you. That means you'll be able to use it with greater fluidity and move in and out of the mode of literate programming (versus more traditional programming styles). Maybe you think, "I know what to write in code, let me just blurt it out." You do, you get it done. Then you reorganize and put it into a literate style because you like that presentation better, or you've reached a point where you need to clarify your thoughts before moving on ("I'm not sure what to do next, or is this really what I wanted? Let's examine it.").