If I had a dollar for every time I asked someone "Okay, look for other uses of this variable" and they grab the mouse and stare at the screen because THEY'RE READING THE ENTIRE FILE LOOKING FOR A PIECE OF TEXT, instead of using any of the dozens of search mechanisms at their disposal, I could retire and write self-help books for programmers.

Stop trying to white-knuckle everything all the time, you masochistic people. Use tools like a sentient creature is supposed to.

I would say that most compilers don't even assume the programmer is human. The root cause of bad errors is that they emanate from the compiler, and are reported from the perspective of the compiler. That's why you get errors like "can't access method undefined of undefined", or the hell that is C++ template errors. Sure, the errors make perfect logical sense from the perspective of a compiler, but they make my human eyes bleed.

My favorite is a single missing semicolon that causes a cascade of unrelated errors, none of which indicate there's a missing semicolon.

grammars, parsers, compilers, and languages as a whole should be designed for humans first. Even if it makes the language implementation a little more complex, human users will benefit greatly and thank you for it.