As for the broader efforts, the New Deal required various things like reinterpreting the Commerce Clause. Look up "the switch in time which saved nine" for why the Supreme Court went along with it.
Not to mention things like the internment of Japanese-Americans during WW 2.
No, FDR was the closest thing we've had to a king. There is a reason why the 22nd amendment was passed so quickly after he died.
By the end of this year, I think you're going to look back on this comment and wonder how you ever typed it. FDR's policies are responsible for literally saving the economy and pulling the US out of the Great Depression.
That said, many historians believe that FDR's actions made the Great Depression longer and more severe. Given that most other countries recovered more quickly than the USA, they may have a point. But that is a complex debate. Far simpler is how much executive power FDR wielded.
The comparison doesn't hold water whatsoever.