I think it does add a lot to make treasure more interesting.
Just making coin amounts non-round goes a long way into making a treasure seem more "real." And with a few punches of a calculator they've got their totals worked out in almost the same time. Treasure can give an idea of where it comes from, where the dragon has been plundering, where the orcs have been raiding, or what kind of tomb the PCs are robbing. It doesn't have to become a huge book keeping scenario, when the PCs return to town, they have contacts (right now the halfling.. um.. "family businessmen") who can appraise and take things off their hands. It gives them a reason to put those skiill points into Appraise so they don't get ripped off, because if you just tell them "gem worth 1000 gp" then what's the point in the skill at all?
That said, only for important treasures, for example the final pull in a dungeon. It's not like every gobiln they come across is going to be carrying around coins minted on the fifth layer of Baator (unless something strange is afoot).