Not musicals, but
An Inspector Calls. A crowd shows up and stands around for about 10 minutes. I often wondered when it was on Broadway, if they even hired actors for the crowd. I think they just shoved a bunch of homeless people onstage.
Three Tall Women. The son sits in a chair in the hospital room and watches his comatose mother. No lines, no stage business, nothing. And for that they hired an Equity actor.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.