> Up to a few years ago, I found often myself in discussions with colleagues on the benefits of Fortran vs. less horrible languages such as C.

In the context of numerics, C is in no way a "less horrible language" than Fortran. The necessity to use pointers in C for multidimensional arrays, and the large amount of "undefined behavior" in the C standard makes it almost impossible to write bug-free number-crunching code. In particular when the person writing the code is a scientist/engineer, not a professional programmer or computer scientist, they are guaranteed to shoot themselves in the foot with C or C++.