Most teams and companies aren't special snowflakes that need individualized organizations, and document hierarchies. There can be such a thing as sensible defaults that you customize or tweak later (no idea if Confluence ships with that - I've only ever seen Confluence installations in their already-screwed-up state). At the same time, an inexperienced user staring at a fresh Confluence install isn't going to get the organization correct right off the bat.

If you have to put in work upfront before the tool is even halfway useful, it better be really damn good after that. Confluence is not.