I hit the bookmark link to my site (Cmd-4 for no good reason in my Safari tabs). Hover +, Post. I'm in the edit screen.
Write my title, make sure the slugline looks OK, write the post in Markdown (I use Jetpack; YMMV if you're using bare WordPress).
Screenshot or art? I just drag it in, hit OK in media library.
Pick categories & tags (I always duplicate my categories in tags; again your process may vary), hit Publish. Note crosspost to fediverse, Twitter, and micro.blog. Elapsed time: 2 minutes at most?