I believe Grounded27 means to say that in older jet airliners, the yaw damper response was relatively slow, and some degree of yaw divergence often existed, but well within safe limits.
In more modern aircraft with more advanced yaw damping systems, the response is much more rapid, and less yaw divergence is tolerated by the system. The rudder makes relatively quick and numerous corrections, resulting in noticably less yawing in flight.
The upswing is that yaw oscillations are nearly unnoticeable in modern airliners, while in an older machine it could be quite noticeable...
J