I think it all boils down to what you are used to.
I was brought up on feet and inches, stones and pounds and miles, because of that it is much easier (and quicker) for me to visualize imperial measurements, if someone says to me, I drove at 83mph today, I can picture that, if someone says, I drove at 116km/h today, without working it out, I can't visualize how fast that is, its the same with height and weight.