Top 10 largest Dokuwikis by page count as of now:
743926 (the mysterious huge wiki hasn't changed page count in 2 years)
306214 (presumably the only 300k page wiki grew)
267575 (this page count is new - I assume it's the site that was at 236180 last time)
251657 (hasn't changed)
244232 (hasn't changed)
239002 (hasn't changed)
236180 (hasn't changed)
235083 (hasn't changed)
186154 (hasn't changed)
178109 (hasn't changed)
Interesting that a lot of the top wikis seem to be not growing.
Total wikis with over 100,000 pages: 29 (+4 from last time)
Total wikis with over 50,000 pages: 72 (+10)
Total wikis with over 25,000 pages: 152 (+14)
Total wikis with over 10k pages: at least 309
Total wikis with over 5k pages: at least 546
Total wikis with 1k pages or more: at least 1635
Total wikis with 100 pages or more: at least 2520
My largest Dokuwiki's ranking: 254th largest (I think)
Overall we can see that there's a good growth of sites with medium-sized wikis and the overall number of Dokuwikis appears to be increasing.
I think Dokuwiki should consider having a list of some of the biggest wikis - Webmasters usually like links to their sites and we could showcase the large wikis as examples that the software works in big use cases. This could come in the form of a showcase thread perhaps.