swiss army knives are the only type of knives that I have consistantly loved and used since I started collecting (and using) knives as a small boy. I've always got a small one (executive with modifications) on my belt, I've another (mounaineer?) in my workshop first aid kit, another (spartan) lives in my car and another in my everyday rucksack (a climber, which is the oldest knife I still use, from when I was about 11).
As it happens I rarely use the knife blade on any but the ones in the car and the rucksack. I just keep so many around me because they have lots of useful tools that are needed at random times. A sak is a lot lighter to have sitting about rarely being used than a tool kit or even a multitool. Mostly I find the bottle opener, screwdrivers, tweezers, woodsaw, file and scissors get used the most.
the small one on my belt takes up no space and fits horizontally near the buckle so I don't notice it there. It means that I have a cutting tool on me when I have to go into 'civilisation' and the rest of the time I have a fixed blade on my belt so the sak provides the tweezers (handy when working around lots of thorns and splinters!) and scissors that mostly get used.
I've got at least a dozen more SAKs sitting in a box with the rest of my old knife collection and though I've sold off most of my good production knives (leaving me with the cheap and nasty and a few antiques), i wouldn't sell them as they are actually potentially useful tools