Well, as far as "worthwhile" goes - as a friend of mine is apt to say, "hmm, that's one of those judgement call things, innit?" :) If you're a linear sort of learner, then perhaps there's some sort of a path to be recalled, which may serve as a guide to other linear learners. Most people, though - at least in my experience - don't learn well that way; it's usually more of an agglomerative process in which certain things stick at different rates depending on what you already know. It's an ever-changing landscape in which you can't predict what will work best, except that throwing masses of (somewhat preselected) information at that particular brain and giving it some feedback via real-world exercises should eventually produce a net gain in learning.

Mind you, I'm only saying this because I've been a professional teacher for 30-some years and studied countless formal teaching methodologies. Otherwise, I'd consider this way too flip of a take on things. :)