I'm an IT administrator in the US. We started using wikis for internal documentation a few years ago, and chose MediaWiki simply because that's what Wikipedia uses. Using wiki software for this purpose has been great in general even if we don't use it to its full potential. Most people on our team have settled on wrapping all content within <nowiki> tags to avoid formatting, but still do use wikilinks.
A few months ago I wanted a place to store interconnected notes at home, and decided to try DokuWiki mainly because I liked the idea of forgoing a database. Now I'm in the process of migrating off of MediaWiki at work. Everyone was enthusiastic about switching once I showed the simplified table syntax and the baked-in ability to link to UNC paths. As the person who is setting this up I like how much easier it is to get the wiki online.
Moving all of our articles from MediaWiki to Dokuwiki took about a month in total. About half of the work involved was simply copy&pasting with edits for the changed sectioning syntax, and this was easy to do. The other half of our effort was to reorganize the wiki content around Dokuwiki's "namespaces" feature. Previously we had relied on mediawiki "categories" for organization, but a document hierarchy works just as well for our purposes. We did install the "tags" plugin for a few cases where articles should be seen as a group.
We haven't needed to refer back to our Mediawiki site for several weeks now. The Dokuwiki site is more responsive, easier to author documents for, and (from our perspective) safer now that all of our articles are just text files on a filesystem.
Posted link to this on the DW mailing list, subject: Nice Testimonial