Since his largest digital prints are much smaller that his largest traditional prints, its comparing apples & oranges. I attended a workshop where he domonstrated his digital manipulation techniques and it made even me cringe - rather loose use of the Photoshop tools.
As far as size of his traditional prints, he describes it as giving the viewer a sense of entering into the scene in order to increase the viewers appreciation of the environment. In person, they are very effective at giving you that sense of being there (without having to wade thru the muck).