I have found that carrying a large folder is really not necessary. I find I do all of my tasks better and with less hassle with a smaller knife. I often carry a Spyderco Manbug, Dragonfly, or Chaparral, or a Delica on the large side. I also have found the Victorinox Alox Cadet to be a perfect pocket companion. The largest knife I actually have need of (note the need) is a Buck 302 Solitaire, but even that is usually overkill.
Most of my cutting is pen knife stuff (a pen knife was so named because they used to make pens from quills with them). I open mail, packages, break down a box here and there, cut tape or strip a wire. I eat a lot of apples country boy style, slicing off a piece at a time and eating it. Occasionally I will need to cut a thread or something. Most of the cutting needs are light stuff. So, I usually choose a small knife that looks good, to me, and cuts well.
What do you guys think? Are most of you served well with a smaller knife? Nothing against a large knife, as I have a few, but the question is, do you have the same experiences I have when you think of what you really need?