It's easy to browse a list of songs using home sharing and import all the songs that are "not in my library".
Once that is done, is there an easy way to get the same playlist on the new library?
There is no option to import a playlist. You can drag a playlist from another computer to one of yours. But that would end up copying all songs again and creating duplicates.
I ended up using Screen Sharing to export that playlist as File -> Library -> Export Playlist..., choosing XML format, then saving it to the desktop of the current mac. From there, it imported the playlist fine, but I was hoping I was missing a simpler, more drag and drop solution.
I can't believe I'm actually looking for another feature to be added to iTunes - it's got to be there somewhere.
Also, I don't want all the playlists - just a few so exporting the whole library won't speed things up or simplify the operation.