Wow I've needed harmony for years, thanks for sharing! My dumb ass was filling out the Musicbrainz by hand for like two months before I just gave up on beets.
You'll want to bookmark Harmony even if you're using Picard since it's driven by the same database. Happily, once you add an item using Harmony, Picard can find your just-entered release almost immediately via the Release ID of the release you just created.
I find myself needing to create releases for ~10% of the albums I tag, and Harmony is a game-changer for that.
