People that are in demand are programmers and good programmers code 90% of time. Some people, including yourself, suggested graphics but read the history of DOOM and read its source code: despite being a cutting edge technology at the time, 90% of the code is the non-math drudgery: reading and writing files, networking code, performant array and string classes, making the code cross-platform and cross-compiler, debugging code etc. Carmack certainly knows his math but he knows his C even more.
Math might be helpful/necessary in some fields but if you're thinking about being a programmer (as opposed to academic/researcher), don't expect math to be more than 10% of your time. The rest is the same drudgery that the rest of us has to deal with on a daily basis.