The question is, "does gyroscopic precession have a direct role in the workings of a rotorhead".
In my current aircraft, if I wish to move forward, I of course apply forward cyclic. However, if one looks at how the swash-plate moves when I apply forward cyclic, they will see something quite different to what they might expect. The swash-plate will not tilt forward, but rather, will tilt to the right. But because the designers know it will take 90 degrees in the direction of rotation before a result of this control input is realized, the aircraft moves forward.
I'm not an engineer or a physics professor, but I certainly believe gyroscopic precession plays a direct role in how a helicopter rotor head works.