In the end, why make it a matter of belief in -other- people's opinion: if this bugs you, keep an eye out for the next headfi-type meet in your area, go there and -listen for yourself-! I'm sure there will be plenty of high-end equipment, connected by equally high-end cabling. Now they won't necessarily let you swap cables, but there may be someone with equipment you are familiar with, using fancy cables, for a comparison. And generally, the whole thing should be fun either way.
I would think that IF cables do make a difference, the most obvious place for that would be the ones going straight to the headphone, which is also where the strongest statements, bordering on potentially verifiably audible, are made (ex.: silver cabling enhances treble, makes headphones "brighter") Maybe bring your own favorite headphones that are familiar-sounding, and see if you can try a pair of upgraded ones, or if yours have removable cabling, ask to swap.
Generally, since I joined Head-Fi, I have read (and learned!) a lot to put things in perspective, and read between the lines of flowery prose for info that would be relevant to my listening experience. I also spent quite some money -_-;; on pretty decent equipment (which I do enjoy a lot) to have a point of comparison when I read reviews or comments, and how much of a difference it would make to my own experience (Hint: at a certain price point, the difference will ALWAYS be (very) subtle, even or especially if somebody writes that the equipment (or cable) "wipes the floor" with every other similar piece...
) And like others wrote: similar opinions are not necessarily a reliable indication of the cable's performance...
I personally have some upgraded cabling, for a number of reasons, but a change in sound quality isn't one of them. After many hours of listening, I still cannot hear any difference.
However, since sound perception is a function of how the brain processes it, and if spending $$$$ makes one's brain think it sounds better and thus enjoy music more, I don't think there's anything wrong with that. But I think it IS wrong to give people on a budget the impression that it's worth spending money on cables when they're better off putting it into components that have a -measurable- influence (Headphones first and foremost!!!, amps, DACs to a lesser extent...) or worse make them think that they can fix shortcomings in their current setup by swapping any cable in the chain... unless these are perceived, in which case the cable-swap may change that perception...
Edited by TheGrumpyOldMan - 5/6/12 at 1:49pm