Most of my bikes have 175mm cranks, though a few are different (180mm on a 29er singlespeed MTB and 170mm on another geared MTB). I do have one road bike with 170mm cranks. I rode the Davis Double century on the back of a tandem that had 170mm cranks that I'd only done a few rides on before.

All the crank lengths have felt perceptively different, especially if I've spent a lot of time on a different crank length, but all those sensations disappear and are forgotten within a couple miles.