If the Bush tax cuts were just to benefit the wealthy, why the concern?

According to CNBC:

Americans would shell out as much as $5,700 more a year if the Bush tax cuts are allowed to expire at the end of 2012, according to a new analysis that highlights the perils and political consequences of the nation’s fiscal cliff….

Wait a second, I thought that the Bush tax cuts were only to help “the rich.” You mean they helped other Americans too? Who knew?