Hi Carlo, it is difficult to answer this question without more details on the exact creative workflow you are referring to.
I can imagine scenarios where PM methods might work very well in fields related to creative pursuits. For instance, if you are managing a marketing campaign complete with external vendors and internal processes to get creatives approved and out the door, that would be a great place to use PM methods.
If you are writing your own book, that would also be a great place to use PM methods, not in a rigid manner, but in a way that will help you stay on track.
Perhaps, if you gave this group a specific description, you would get tailored answers to your specific situation