You can probably feel it more with mechanical brakes, but what is it you're feeling? What tells you you're applying too much, or not enough, brake? I could be wrong, but I think it has little to do with what you're feeling with your hands or fingers. I think it's much more about the change of inertia (how much you feel like you're getting lifted out of the saddle, and what your eyes tell you about whether you're going stop in time or run over the little ol' lady in the crosswalk. If you don't think you're going to stop in time, then you brain tells your fingers to squeeze harder.
I think the relevant neurons are all firing in nanoseconds, so maybe it's hard to tell. Even on the same bike though, brakes don't always work consistently. Maybe the pads are wet, or hot If all you're going on is how hard you're squeezing the brake levers, that just ain't gonna get it.
TT