I don't understand why Dokuwiki isn't more popular. It is super easy to use, there are a good bit of themes and plugins that can be installed through the GUI, it loads pictures fine (and has a little picture tracker interface where you can browse uploaded photos), you can use the farmer plugin to multiple seperate wikis on the same website and it doesn't require a database (all the pages just sit in a folder you can copy/backup anyway you like) so it is stupid simple to backup.

I think it is kind of a shame really, Dokuwiki is a beautiful bit of software in my opinion.