I studied photography when i was 13 at actual school for couple years, and was going on and off since then. I never heard about ZS until i did hit about 32
So no, i don't use it. But after i kept hearing about it - i did read books about it, analyzed and discarded most of it, b/c it has nothing to do with creativity, i am sorry. Now, using what Dean Collins and what Mortensen and others taught - i am.
But then i am not primary focusing on landscapes.