The US has proven it's not immune to great recessions or housing bubble/bursts - no need to even mention Europe. No system is completely safe or stable. Inflation in the US is an issue, but when compared to Argentina... it doesn't seem so bad.
Wages are stagnant, there's a growing gap between the upper and lower classes, and things like college and healthcare are squeezing the middle class - but in the US people expect inflation and usually plan for it by investing and setting up retirement accounts. In time money devaluates, but there's also ways to make it appreciate. It's interesting to see the amount of advertising dedicated to insurance plans, trading, banking, tax services, etc. Not once have I seen a commercial here referring to nest eggs, life insurance, retirement plans.... here in Argentina planning is futile! Sure, you can squirrel money away, but you're actually better off just spending it and then hoping the government is still in condition to take care of you when you get to old age. (Not my advice, just saying that's what a lot of Argentinians do... the ones with serious money obviously know how to take care of it.)
The US also has the advantage of holding the world's reserve currency - dollars are welcome pretty much everywhere, but that's not so much to do with all the things the US is doing right, but rather the fact that most of the world is being just as reckless. As seen in Europe, soon enough things come back around to bite you - the US debt is serious problem.
As for the OP, yes, holding dollars is obviously a huge advantage. It makes a big difference in prices to divide by 8 instead of 5... prices seem almost reasonable! Too bad I don't earn in dollars. I'm not sure I'd trade on the black market anyway - just traded some dollars to a family member, and although I might have gotten a better rate on the street, at least they're still in the family and I don't feel bad about a possible loss had I waited longer to trade.
I wonder how many people still trade at the official rate. I feel bad for tourists that are practically getting robbed by the bank.