I was impressed many years ago with a movie scene, in which people who had died (appeared somewhat translucent) in an old classic black and white film, a man and woman sitting on a park bench and watching and commenting on how everyone who was still alive seems to be in such a hurry. I can't find the movie and would love to know the title. I've looked through topper movies, but this one wasn't a comedy.

That sounds like one of the film versions of Thornton Wilder's wonderful play "Our Town". You likely saw the 1940 movie.
https://en.wikipedia.org/wiki/Our_Town_(1940_film)

You can read the play's summary here:
https://en.wikipedia.org/wiki/Our_Town

I believe you're remembering a scene with Emily (who has died) and the Stage Manager.

You can watch it on YouTube:
https://www.youtube.com/watch?v=Y30j0UQZHhs