Lets see, I carry a Wave and I have used the following for doing stuff other then fixing commercially made things:

The pliers: I've used for rope work, grabbing hot pots and foil bags, pulling out splinters, cutting fishing line, cutting snare wire, pullig out tent pegs, as well as many other things I can't think of right now.

The can opener: Has been used to open cans and bottles.

The saw: I use it all the time, as I usually don't carry any other kinds of saws on me. I've also used it for making deadfalls and trap release mechanisms.

File: Sharpen my other knife with the diamond side, used it on wood when doing carvings.

Screwdrivers: used for punching holes and for working knots free.

I think as multi-tools get better (and they are improving, recently Leatherman released the charge series which have 154CM one handed opening blades, same as a lot of common "better end" knives) they may replace the single bladed folding knife as what most people carry on a day to day basis. It seems as if in todays technology based world a screwdriver is just as handy as a knife. A single bladed knife is becoming less people friendly, while a multi-tool is seen more like the modern version of the Swiss Army knife which is seen as non-threatning and usefull. I know of quite a few people who when they go camping carry nothing more then a multi-tool, no fixed blade, no folder, no saw. To the average camper the blade is enough and the can opener, pliers, ect are very handy for the modern camp tasks with todays equipment. They simply have no need for anything more.