The amount of help the correlator gives varies from machine to machine. I have 5 Bell 47s and they are all different. It definitely helps when you are making small adjustments by moving the collective up and down but for take off power or throttling back for landing you have to use the throttle mainly. It is not a governor.
If there is a virtue it is that you really learn how to coordinate the controls in a Bell 47 which helps when flying other machines. Our students seem to master it without too many problems. If we have an R22 pilot it is a different story. They seem to have real trouble learning how to use the throttle.
Regards,
Chopperpilot 47