I've been using PmWiki privately for over 10 years. I still see the main advantage in the fact that I don't need a database service, as with most other CMS.
I mostly understand the PHP code and can sometimes help with problem solving, but I don't see myself as a developer.
I am also very impressed by the consistency of further development and support. This is where many CMS systems could learn a thing or two.
One of the reasons why I am happy to support the project financially on a regular basis within my own framework. Thank you for your work.