The Patriot act doesn't even come close to emergency powers. And the Patriot act would've been insanely worse if the US had the equivalent of our non withstanding clause.
So no, it hasn't been doing the same. Bush and his cronies sure would've wanted to go further though, I agree.
Also, another difference is that the Patriot act has been very controversial in the years since. Whereas the same hasn't been true in Canada for the usage of emergency power. And no one seems to care that we see more and more laws passed with the non-withstanding clause either.