I am a longtime but low-key Wikipedian. I've created two articles that have (so far) avoided deletion — Shelly Chartier and Glen de Vries — and I contribute regularly to others.
Originally I thought:
Wikipedia... is the best thing ever. Anyone in the world can write anything they want about any subject, so you know you are getting the best possible information.
I imagined it could be a place to ideate and crowdsource ideas, but I came to realize that is not what an encyclopedia is.
I have made extensive use of MediaWiki, having set up giant wikis inside corporate intranets. In my edit history you will see I take an interest in enterprise collaborative software and search software, though much of this field may fall below the threshold of notability, so I may need to collaborate on that topic elsewhere.