One myth which I hear often is:
You have to first learn to fly fixed wing before you take helicopter training.
Or, Helicopters can do instrument letdown vertically over a NDB and dont need to do the full approach.
Regarding all this complicated aerodynamic stuff on how the rotor behaves and works, I think my old instructor explained it best when he was trying to get us to understand some complex aerodynamics stuff. He said:
"This all is besides the point really because the only thing that makes a helicopter fly is MONEY, and lots of it. Without money no helicopter will fly!
How true : )