For me, it's pretty much the opposite. With the exclamation mark, I'll see the inversion, then I'll read the actual condition and try to make sense of it, and then I'll remember that this thing was supposed to be inverted. Or I won't remember, that's unfortunately also a possibility.

Might just be what we're used to, though. I have been working in a codebase with mostly .not() for the past year.