I'm 6'2" and have been riding 180mm cranks on my bikes since the mid-'90s. I also have one set of 177.5mm and rode those for a couple months and they felt short to me.
I recall an article in the old "Winning" magazine about climbs on one of the classics. Whoever wrote it borrowed a bike from the 7-Eleven team and made a comment about the cranks. He said he was used to 177.5mm but the 7-Eleven bike had 175mm and he "really missed those extra 2.5mm."
Without adding up the score on who can sense things, it seems that those accustomed to riding shorter cranks notice it less than those in the longer crowd.
Or maybe they just don't care.