It builds the patterns up slowly, one block at a time, but rarely does it require the kind of intuitive BIG PATTERN RECOGNITION that macroscopic learning demands.
The use of pictures certainly seems the most intuitive method for navigating around videos -- there's a definite learning curve here, and it's hard enough to select pictures -- we couldn't really imagine toggling through small text.
We have the benefit of applying learning about usability and adoption garnered from our consumer products to imbue intuitive simplicity into our commercial products.