Thanks for the response!
I’ve had trackbacks/pingbacks disabled through wp-admin/settings/discussion for a while now, but that seems to only affect posts, not pages.
Disabling comments one-by-one seems a little impractical in my case, especially since I also seem to be getting trackbacks on attachment pages, which aren’t accessible through wp-admin/pages/all pages.
I might try out that little mini plugin, although I’m averse to adding more plugins to my install and would rather use another method.
Thanks again for the help!