As a physicist who does a lot of mathematical programming for my every day job, I'm going to disagree pretty hard.
Who in their right mind does math on a computer, math is implemented on a computer, but it's done by hand.
Maybe you think this becuase your used to writing math on computers that make writing that math ugly and obtuse?
Besides, having the math you've written by hand closely match the syntax you use on the computer can greatly reduce the cognitive burden of switching between code and paper.
Making your code performant, and doing a thorough numerical analysis, usually requires a significant rearrangement of your formulae.