I was project manager over a FORTRAN project in the early 1980's. I remember very clearly how our team's productivity went up as well as satisfaction when the developers starting using the Ratfor (Rational Fortran) preprocessor. https://en.wikipedia.org/wiki/Ratfor

At the time I did not realize that Brian Kernighan created Ratfor. Ratfor changed my thinking about program structure and coding style more than any other single event in my professional life.