I'm just one more user of PmWiki and - that is why I'm using this wiki - very impressed. It is a really nice tool, giving enough space to tinker around with it, but without the need of having so much of "hard coding" experience like other tools require. So, there is more time to concentrate on content - I'm using it as a CMS to maintain some information pages as well as a "personal system" for getting my daily work as an editor organised.
What I really would like to see is that the documentation of this wiki as well the tips within this site would be as fast as the development of pmwiki itself - slow down improvements a bit and try to keep pace when updating the documentation. There is really a bunch of potentials even with the actual output, but no time to discover... Slow down and maintain.
One of my pages (German only): http://www.FamilieMitKind.de. As you can see: a WikiFarm.