UPDATED: Drop to Add and Make Playlists v2.2
Drop to Add and Make Playlists v2.2 will accept a single dropped folder containing media files and will add each file to iTunes and then distribute the tracks to playlists named using your choice of the tracks' "Artist - Album" tags or the name(s) of the folder(s) containing the file.
This latest version fixes a problem with trying to process files that cannot be added to iTunes.