Well, I'll try to explain better:
MC has native support for single image file, which is linked to a music file or placed inside the file's tag area. Actually that is not an album image but a track image. MC can find it automatically if certain conditions exist. Instead you can manually link one image file to a single track or to several tracks (e.g. to all tracks in one album).
MC has also native support for importing image files to the media library, e.g. your digital camera images. You can tag them as you like. With MC you can show image files in slideshows when playing music files. I use that capacity for playing and showing my albums.
I want to have my albums complete in MC, including music, cover art and printed information. Usually I scan several images: front, back, booklet, inlay, CD 1, CD 2, etc. I make them at least 800 pixels wide. If there is small printed text I make them bigger. So all text can be read if/when enlarged (you can pause the slideshow and enlarge an image). I also make a smaller version of the front cover, which is used as a usual track image. I store all images in the album folder.
I import those image files to MC and tag them. Because they have the same album tag as the music files the images become part of the album in the MC library. I can see them together in the All Media view. I can search for the album name and I get a list of the music files and the image files. If I send them all to Playing Now, MC displays a slide show during the album playback. I can also make playlists of them (incl. music & images).
I have not found tagging them too awkward. Importing and tagging the image files takes only some seconds. For example, you could do that just before listening to each album. Listening to an album takes usually at least 40 minutes.
Here is an example of the files included in one of my albums:
Here is an example of the album images:
The file named "Bonnie Tyler - Silhuette In Red.jpg" (labelled as "Front") is the standard cover art image, which is associated with the music files. It is used when I play single tracks in various artists playlists.
When I play the whole album with images I don't usually include that small image in the playlist because the cover is included in the "Booklet 1" image. In this case the booklet spreads are 1600 pixels wide.