subnav

Im struggling to wrap my head around which or rather how to construct menus for content heavy and simplistic (brochure) sites. I have a friend who recommends I use books for both. Only use new content types for pages that function differently or do not have the same fields. From a users (editor role) point of view it works really well, since there is way less clutter (not seeing all the primary nav items and subitems) when trying to add a new page to your site structure, and it works really well by using a book menu block per page.