i mean, what is the point in laying out your UVs 0-1, 1-2 etc if you are using multiple materials? the Uvs repeat so it doesn't matter. The only benefit would be that your UV editor would be nice and neat. you could use uv sets.
Sorry i didn't watch the video. I use the method you are talking about at work. If i have a character i can have a 4k map for the head and the arms and the body etc but all these maps are connected to one shader. its cool it works great. it takes some time to setup especially in mental ray.
For a beginner its a total waste of time. just learn the regular material setup first. It certainly shouldn't be in the newbies section of the forum. I don't mean its difficult, just that it takes more time to setup and is probably totally unnecessary.