For me, on meats that will have color in them, it is Science from now on. I pretty much know that on a piece of meat that I want medium rare, that 135° +-2° is gonna be it for me...Why guess! The high temperature IT's, that is all feel!
And if you do want to go by feel, a good guide is to use that little area between your index finger and thumb. Lightly touch your index finger to the thumb and feel that area, that is rare, middle finger, med rare, 4th finger medium, pinky, med well...