Wow, I never thought this thread would go this long!
Looking back now over the past couple of months since I wrote the original post, I don't think I've carried a knife with much over a two inch blade more than once or twice.
Some of the knives I've carried of late are Andy Worden's old Buck cadet at 3 1/4 inches, a Victorinox small 84mm tinker at 3 1/4 inches, my dad's old brown bone Case peanut, my yellow CV peanut, a small Kissing Krane brown Mule, small Case sodbuster 3 3/8 inches reground to a spearpoint making it a bit shorter, and the little Buck Hartsook that a friend gave me in early December. I've surprised myself by becoming fond of the little fixed blade Hartsook with a blade of 1 5/8 long. In truth, its done the "unfolding pocket knife" chores its been put to. If my pocket knife is too small, then I should be using my old Buck woodsman or Mora belt knives.
I now understand how my father and gentlemen of his era got by with small penknives. With a moment of thought about what you're doing, the small 2 inch blade will get it done. Maybe thats really what I love about all slippys- it makes you slow down while opening it to think about it. Like with a single shot break open shotgun, you have to plan your action.