The weaker USD has an immediate impact for the US citizen who needs to convert his dollars into Swiss Francs or vice versa. But
comparing a US citizen spending his dollars in the US and a Swiss citizen spending his francs in Switzerland, the deep slide in the exchange rate between the USD and CHF does not seem to have had a profound impact on the relative standard of living in both countries. In fact, correcting for purchasing power, the US and Switzerland are still neck and neck when it comes to GDP per capita:
List of countries by GDP (PPP) per capita - Wikipedia, the free encyclopedia
I'll let people smarter than me debate why that is.