This post by Geri Reid questions the traditional folder-based approach to documentation:

For years we’ve treated documentation like a filing cabinet. Put the thing in the right folder and give it a label. But much as it pains me, people rarely wander through my carefully crafted hierarchy, admiring the taxonomy. They search, skim, follow links. And the second finding information feels like work, they’ve checked out and just asked someone.

I have to say, this was exactly my experience on a recent guidance project. Users would often find the document they wanted and make a direct copy to keep locally. Of course, when guidance was updated, that local copy was soon out of date.

For these users, knowing where to quickly find guidance was important. To heck with the shared folder structure! And for those times where they couldn't find the right guidance document at all, they would simply ask a colleague for the answer.

Needless to say, I learnt a lot from this experience. It's important to organise documents in a clear, sensible way that people can easily navigate. But don't think for a second that users will or want to carefully wander through your folder structure to find what they want.