I think the only reason people use FORTRAN is because of the large number of (fast, well-tested, reliable) Numerical libraries available for it - all of course in Fortran 77. I find calling FORTRAN libraries from C, to be much less mind numbing - again thinking here of Fortran 77, not its modern evolute. Then again this also what MATLAB, Octave, Maxima, SciPy do; sometimes however endless layers of abstraction can be stifling.
Things however are changing; FFTW is one fine example of this.