My orchestra time was long ago, but I remember that's how I knew I was in tune, you don't hear the pitch, you feel the resonance of the section. It's a lovely feeling, I can occasionally get it playing DB in Jazz/Bluegrass, especially if there's another instrument that needs to 'find' the note, fiddle being the most obvious example. But it's for the same effect that I love doing BVs, that moment when a 3-part harmony comes together perfectly, although rare with my lot, brings that lovely resonance