This is a very simple chrome extension that I put together in about an hour so that I can export my queue from YouTube to a playlist.
If you have this extension enabled, you should see a "Save Queue" button next to the "Clear Queue" button. When you press it, your queue will be converted to an untitled playlist.
Note: this extension is very basic and was created from my personal need to not lose good queues.
However, there is a maximum amount of songs that it will convert (50 afaik).
If people find this useful and there is enough interest, I may spend some more time on it (and possibly use the "proper way" of converting to a playlist; aka through the API).