[Demiurge]

I don't think OpenGL or D3D or 3D programmers deal with 'parallelization' much. There are very common things that have to be done that in reality are mathematically parallel, but are basically one unit in the API, such a texture, or geometry surface and transformations. It is true complexity, in multi-graph fashion. So, even if we didn't have massively paralle GPUs, we would still come up with same exact abstractions, not because we are not good at thinking massively parallel, but because there is no need to rewrite a loop over a matrix a billion times.