Several of the above posts demonstrate the misunderstanding that causes this problem. All the "Dead leg/Live leg/Stamp on floor" stuff is for after you have the aircraft nicely under control using the correct rudder.
The main problem is that the majority of modern pilots very rarely need to use the rudder at all, and when they do it's often engine failures in the sim which as parabellum says is not very good at yaw cues. Stepping on the ball is a good introductory way of teaching the use of rudder, but not nearly as good as recognising yaw directly and preventing it rather than curing it. A few hours on a taildragger would soon teach people all about this!
Interestingly, if you read the details on the Concorde accident one of the factors raised (which had no bearing on the outcome) was the poor response of the PF to the yaw following the engine flameout (caused by the fire effects from the fuel tank leak). They attributed this to the fact that the sim did not accurately model the aircraft behaviour in yaw, and base training in the a/c was limited to single engine failures with a slow spool down; therefore the PF had no experience of how the aircraft behaved with sudden engine failures. Whether more general experience in controlling yaw would have helped is not explored.