I do a lot of incredibly specific VHDL and 45GS02 asm, so the answer is none.
Even if I didn't do obscure things with obscure languages, answer'd still be none, because I'd rather spend a few hours learning what the code does and how to use it, instead of "just hope the output runs" while not knowing what and why it's trying to do what it's doing.
Ignition!: An Informal History of Liquid Rocket Propellants by John D. Clark. It's a surprisingly fun read.