I think I've watched Koyaanisqatsi no fewer than 50 times....and perhaps a good deal more. I first saw it on public TV when my younger son (25 now) was a very little guy of 3 or 4. He used to sing: Skatsiiiiiiii with the film which was both charming and hilarious (he was totally unaware of himself doing it.). I now own a DVD of that and Powaaqatsi; I've never encountered the third film at all.
I think Koyaanisqatsi is the most singularly successful, organic blend of music and film I've ever seen. It was also my introduction to minimalism and the music of Philip Glass. I soon learned to appreciate Steve Reich and John Adams as well.
It's so utterly dynamic and temporal that that it 'controls' the way time unfolds, and that is a wonderful accomplishment. What it doesn't do is inform the way I see as a still photographer.