When i started teaching 29 years ago i used to use a textbook that i eventually grew to despise and drop. The text wasn't horrible, it just didn't fit my teaching style and became too limiting.
BUT...
It really made a difference in the beginning because it gave me a structure and suggested a sequence that gave my early teaching some cohesion. I would hate to be a student of a first time CFI who scoffed at the idea of a "pre made structured outline" in fact the FAA created FITS...but I suppose we should scoff at that because it is pre made for us.
The outline doesn't have to impede your own creativity in creating lesson plans...its just an outline. And even if you used a prefab lesson plan, there is still room for your teaching style, your choice of visual aids etc, again its just an outline. Over time you will probably replace stuff that you feel you cover better or you come across something better. It's all part of the journey.
When I see a kid with training wheels on his bike, I don't berate him for his lack of cycling ability and make gross generalizations about the low state of affairs of all these kids using a crutch.
I do appreciate all of the responses even if I disagree with some of them. Thanks for the lively debate!