I use the "lookup CD" feature in Picard, which gives me a selection of releases to choose from. Among the choices, I usually see a release matching the catalog number on my CD's case. When I don't see a matching release, I will typically add the disc ID to an existing release, or I will create a new release, or sometimes even creating a new release + new release group and add the necessary metadata to MusicBrainz.
I haven't tried any automatic tagging process like the ripping program the article talks about does, mostly because I want to use Picard to make sure the metadata is correct or contribute to MusicBrainz if it isn't.
I like MusicBrainz a lot because applications like Plex use it very well to group release groups together and will (usually) deduplicate identical recordings so that identical tracks can share a rating. It's a really great database and is kept up to date pretty well.