Earlier quoted context omitted.
People are super religious about this but I've never been able to tell pre-shredded cheese from cheese I've shredded myself and I don't think anyone else can tell the difference in a blind taste test.
Perhaps the best example is parmesan. You should buy a small brick and shred it, then compare to the Kraft tube we all know -- the difference is massive.
I started buying real block of Parmesan cheese and it's certainly different more sour. The crystals closes to the rind are where the flavour is. Kraft may not even be Parmesan US laws allow other types of cheaper cheese and lots of cellulose sometimes 40%. edit: I should note the crystals theory is from a Parmesan factory documentary. Is it true? They seem to believe it is.
I think it's to the point now where Kraft and real Parmesan are close to the same price especially if you factor in less cellulose in the real stuff.