I recently discovered this:

1. Create an account
2. Go to your common.js page
3. Paste in the following and save:

mw.loader.load( "https://en.wikipedia.org/w/index.php?title=User:%C3%9Ejarkur/NeverUseMobileVersion.js&action=raw&ctype=text/javascript" );

See the script page for more info.

And voilà! Wikipedia will now redirect you to the desktop site if ever you land on the mobile version of Wikipedia, so long as you’re logged in.