I am looking for the same as you for a long time now, nothing happens on this. Seems, you and I are the only ones interested in this feature. I really would like to have a feature, which makes an automatic mood tagging. Then I could create playlist according to the mood. It would be even better, if I could say "first 60min this mood", then "next 60min that mood" and so on.
So far, I am using MusicBrainz Picard. As you say, it could be more user friendly, but it is OK to use. The user interface is pretty 1990, but better than nothing for the moment...