I think of Hayao Miyazaki's obsession with the buildings in his movies (I've got a book just on the architecture in Studio Ghibli films)—how they need to tell specifics about those who inhabit them. The little details aren't flourishes just to make things look nice: they carry the content of the story. They define characters & places, so that we really *understand* them.
For truly dense, rich storytelling in a visual medium, the visual details are absolutely essential.