Gad, I haven’t heard those architectural terms since grade school in the ‘60s.
You apparently didn't understand them, then or now, or you wouldn't have insisted a couple of times on this thread that there were no spectators. :-)
The whole length of U.S. history would fit many times into the length of European Christendom's history. Notre Dame is nearly a thousand years old. Europeans would naturally still be more familiar with church floor plan terms that we cowboys of the New World.
Notre Dame is vast, but the acoustics are exquisite, as they also are in most of the grand European cathedrals like St Paul's and Westminster. So the congregants are seated some distance away and just weren't visible on those camera angles.