Being as though it is essentially just a big, slow moving meal.....why wouldn't it work everywhere? Don't look at it as a specific "thing," look at it in a general sense as I just stated.
I think the difficult details of this journey lie more in locating big fish than actually catching them. Big fish are typically predictable (best ambush spot, best spawning location, etc) however they have the advantage of being underwater and seeing these spots. We don't. I feel that is what takes the longest time in this whole thing. If you know where big fish are, you're going to catch them sooner rather than later. I've got a feeling that once AJ discovers a few of those select "best spots" that catching a big fish will just be a matter of time.
I agree that being patient enough to practice this technique requires a specific skill that most do not possess. That's another key...doing things that the fish have not seen in places they don't typically see a bait.