Had an opportunity once (when we were still "honest" citizens) when I was allowed to visit the flight deck because the Captain was a club friend of mine. I asked the question about the infamous "Dutch roll" and he let me fly the aircraft with the damper off. It did not take long for me to become "out of sinc" with the yawing and the aircraft would have increased the yawing until a nasty roll would result. It takes some hours of experience for a pilot hand flying an aircraft until he can anticipate the motions and make corrections in sync. I compare it somewhat to being towed behind a power plane in a glider.
I saw that yawing may also have been reduced because of only using the inboard "flapperons" instead of outboard ailerons like in the old days. I could be wrong, but it seems logical to not cause drag on the outboard wing section, which only adds to increase the Dutch roll.