The switch from MediaWiki to DokuWiki was motivated by ease of namespace creation. I use the blog plugin (and a corresponding blog namespace) to catch spontaneous thoughts. There’s a stories namespace for narrative content, and a namespace for archiving the main thread on the CBB forum before I started the wiki. There’s a lore namespace for more wiki-like stuff that has graduated from the blog and megathread sections to be more polished.

There might be a performance hit thanks to everything being stored in the filesystem rather than in a database, but direct file access allows a lot of flexibility. The other big downside to DW is it’s very much not “batteries included”. You probably need at least a few plugins to get it up to speed with some of MW’s features, like page categories (tags) and listing wanted and orphaned pages.