What about radio dramas or documentaries? I like BBC ones - some are definitely available as podcasts for those not in the UK.
Murder in ice valley was interesting and I love to go to sleep to In Our Timet

90's era Star Trek is a popular choice with many of my generation.
It's dialogue-heavy, sound-effects are consistent throughout.

well I don't know much about this but I bet you've found this website. www.listentoamovie.com I found this show Wings on it from the 1990s and X Files and Monty Pythons Flying Circus, and a dark comedy about Shakespeare acting: Slings and Arrows.

Hard to say without further information about your tastes. If you turn on $1 you could watch thousands of movies with a black screen (though the selection will depend on your streaming service: Netflix and Prime Video have the largest collections, HBO Max doesn't offer a massive amount but they are adding new titles weekly, Hulu gets a small trickle of new described content every now and then, sometimes.) If you want just the regular audio with no extra track, Goodfellas/Casino or Shawshank Redemption might work pretty well, anything with a voiceover to narrate (Grand Budapest Hotel, maybe? The War of the Roses?) I think Tommy Edison the blind filmcritic once said that Clerks is a favourite movie of his that you can watch without description (though I don't know if you like Kevin Smith at all, YMMV!) Filmed versions of plays are easy to follow, but their quality tends to vary quite a lot so you have to do more pre-viewing research. Rachel Getting Married, from what I can remember, is largely a dialogue movie with really immersive atmosphere/detail. Some Coen Brothers films might be fun to listen to, with Fargo for example you have Carl's horriblly awkward fifty-dollar bribe, the lunch with Mike Yanagita, or Marge's polite, patient attempts to interrogate people who are either deceptive or dimwitted (Inside Llewyn Davis, as well, for the folk music.) Mary and Max is a story told through letters and narration by Barry Humphries. Popstar: Never Stop Never Stopping and Walk Hard: The Dewey Cox Story are two mockumentaries filled with musical and verbal humour that does not require sight to appreciate. For nonfiction, I like The Imposter (story of Frédéric Bourdin the identity thief), $1 (LEGal doc), Lorena (did nothing wrong).