Beautifully written and animated. Sometimes the simplistic stylings are able to convey more that a full bodied animation, and in a helluva lot less time to craft. You are correct about picking up something new each time you view it. It is easily one the best animes, I believe, that draws you in and makes it feel like the entire show was made for you and you alone. You can easily relate to each character in some fashion and feel the emotions involved as if it somehow happened to you in some altered dimensional way. The connections are raw and intense, but still sincere enough that you could actually believe it could have happened.
I for one absolutely love the show and the first time I saw it on Adult Swim, I was blown away by the story, animation, and characters. I've been a fan of anime since the late 70's, but this show has drawn in me in so much, that I have yet seen another anime that can even touch the boundaries that this show has to offer. And like you, I delight when I can spend a week waiting for the next episode to air the following night.
Oh, and if I am correct and what I have been told, what does Fooly Cooly (Furi Kuri) mean? Anal play.