You don't need an overview. You need a fast and absolutely hassle-free way to retrieve ('find') a document. For instance, if you want to add an item to your 'things I want to cook'-list, the retrieval has to be fast. There is no need to know what other material you have stored.
Originally Posted by Tom.9
The second needed part, aside from fast findability, is a process to weed trough all the material one by one and decide if you want to keep it further. DA talks about this briefly in GTD an refers to a once-a-year 'dumpster day'.