Germany is also doing well with a devalued currency. If Germany still had the Mark, instead of the Euro (which is being devalued by all these crisies) it would be higher than the Swiss Franc right now.
What is true is that Germany has put in place a devaluation strategy (by reducing wages instead of devaluating its money), but this has been a catastrophy for Europe as a whole. "Real" gdp growth comes from increase of productivity: devaluation helps hiding this for some time, but not that long.