This is a placeholder topic for what works well in GlobalPrefs. In a chat on #wikimedia-tech, I heard good things from Wiki13, revi, legoktm and addshore about it. :)
Topic on Help talk:Extension:GlobalPreferences/Flow
As someone who visits many, many different language wikis, I'm very much looking forward to setting my global language preference one time and never have to worry about it again, rather than having to change it with each new wiki I need to interact with in-depth.
This feature seems to be what I need. I want to disable email notifications for all Wikipedias except in those where I'm active. I don't want to get those messages from Wikipedias, where I can't read a single letter (because I don't know the language) and never did an edit. Waiting for deployment :)
Yippee! Funnily 'nuff, an english-us term to celebrate being able to set all my lang to -gb...
Or all my base to belongto-us.)