In English, a king is always a man. It would be so much weirder to start calling Elizabeth "King Elizabeth II" then to call Prince Phillip "King Consort". This isn't Scandinavia we're talking about. In the common vernacular in English, "King" and "Queen" are equal titles, and should be treated as such. The history of the language doesn't matter. Languages evolve. I can just as easily cite the game of chess as an equally ridiculous reason for why the Queen is more powerful.
Eh, even in English Hedwig/Jadwiga of Poland is King Hedwig in all the things I've seen, and I'm sure the same applies to references to Christina of Sweden, though I haven't gone out of my way to see any.