I'm a graphic designer, a web designer, and I wrote a graduate-level thesis on user interfaces, so I am VERY critical of websites, especially ones that are for commerce, and where easy navigation is critical.
The GV site is, in my opinion, pretty cluttered and ugly. But I see no problem with the navigation, organization or user interface they use. Everything is clearly labeled. There are easy-to find links for every subcategory. The side-bar is clear and consistant throughout the site.
It's ugly--there is no debating that. It is overly busy with all the animated headers and banners, and the multiple columns. If you are viewing it on a small laptop or a portable device with a small screen (like a smart phone or tablet) it would be an impossible-to-read aesthetic nightmare. But on a typical laptop or desktop computer, it should be easy to read (although cluttered, busy and ugly.)
So I guess I'm not sure what you are on about, saying it is hard to navigate. It IS distracting, and the multi-column format is cluttered and overly-busy, but the navigation seems pretty straight-forward, and it has a "search" function that works pretty well...