For the hesitant cook

Today, I was cleaning out our kitchen drawers when I found some measuring spoons for dash, smidgen and pinch. I wonder what the difference between them are and why we even have them? Does it really matter if you put a smidgen in a recipe instead of a dash? or a dash instead of a pinch? Why is this so amusing to me? I don't know, it wouldn't make a smidgen of difference to most people, but maybe a dash. ;)