(...) The message is clear and should be easy to spot for everybody (...)
That message doesn't appear when you do something with the files, like tag update, playcount sync, etc.
You are right. The statusbar is being used for displaying other info at the time so the message does not appear then. But I don't think there is a reason to. When someone chooses to love a track I bet most of the time he/she is not updating tracks, playcounts etc. It is done on-the-go as you listen to tracks. Surely the message will be noticed at some point.
I would suggest a tooltip but I think it would be too intrusive then. So rather not...
