Yes, every time I've been to a matinee showing the theater has been about 80% empty. During the summer when school children are out of school, there might be a bit of a jump but that's it.
The high volume show times for movie theaters are the evening shows when the technologically friendly people are out and about.
Maybe it's different in Atlanta than here. I don't know. Weekday matinees are running about 50% full here, at least for popular movies. Maybe the Minnesota geezers like movies better than they do in Atlanta.