I got the exact opposite. Quick and curious on the US side and much scrutiny on the Canada side.
When you leave Canada its even worse.. Been up there a dozen times always the same.
We go through the Thousand Island crossing.
Theres one French sounding guy, you better be straight forward with. Any sunglasses or unnecessary talk and he will pull you in and you will be inspected.
A-Holes.
And you will have to have a passport, like a driver license, if you drive through.
Full blown book type passport if you fly in.
And they do it all with a smile.