First and foremost, I don't write – I don't think I have ever started an article or written more than a few sentences of original copy. No, on the contrary, I do maintenance: formatting, copyediting, cleaning up, creating redirects, making disambiguation pages, inserting navboxes, deleting old junk, commenting and nominating at WP:XFD, sometimes patrolling new pages, fixing user scripts ... the list goes on.
For several years I was one of the more active maintainers of the popular anti-vandalism tool Twinkle, and I also wrote the Commons migration tool For the Common Good. (I am atlight on GitHub.)