Man that is one hell of a movie.
I can't tell you how pleased I was to watch this movie a second time and see things I hadn't seen before. Dialog, character beats, things like that. Always the mark of a good movie.
There's not all that much to mention other than that on a second go-round I got to enjoy more of what was going on in the movie and not just desperately hang on with both hands and try to keep up. But everything you've been reading about the old-school expertise filmmaking in a 2015-era film is right, right down to the use of "fade to black" as transitions between acts. And, really, no mainstream movie has done more to show rather than tell in years.
And you can't really say enough about George Miller's sense of world building. If anything fell apart in the 1980's cheap post-apocalyptic knock-offs, it was pretty much every single detail, but it started at the lack of thought put into the world - what was it like living in a world where the grid had fallen apart? Everything is built with motivation in mind, and not all of that motivation says much good about humanity. But it drives everything from vehicle design to the mythologies and modes of survival. It's what some of the best movies do on screen, sci-fi or otherwise, and Miller has been living in this world a long, long time.
Anyway, likely I'll watch this one again and again for some time to come.