How does anyone even see the PR template? If you fork, push a branch with your fix to your fork, go to your fork in the browser and click the "Compare & Pull Request" button to make a PR from your branch [1], you don't see the template at all. The UI is auto-filled with the text from your commit message.

I thought everyone filed PRs this way; is there another workflow I haven't heard of?

[1]: It takes you to https://github.com/$upstream/$repo/compare/master...$you:$br...