First of all, GDP and GDP per capita != standard of living.
Even regarding GDP per capita, most the "few exceptions" you mention that trump the US are western European and nordic countries with the exception of #4 Qatar.
1 Luxembourg 102,717
2 Switzerland 80,603
3 Norway 74,598
5 Ireland 61,206
6 United States 56,084 <---
7 Singapore 52,888
8 Denmark 52,139
9 Australia 51,181
10 Iceland 50,277
11 Sweden 50,050
And don't think that a 10% change in GDP per capita (like e.g. from USA to Sweden) means much in terms of standards of living -- there's the distribution of this GDP, the organization of everyday life, work standards, state services, etc.