It's so hard to explain "the sound" to someone who has never shaved their head. It echoes inside your head as the razor scrapes by. And yes, there's something comforting when you pass the razor over the same spot again and the sound changes from a scratching sound to s softer but still unique sound that nobody but you can hear.
And, I've said on other threads that barber shop shaves never get as close as I get shaving myself, but "the sound" is even better when a barber is running a straight edge over your head in short firm strokes.