I would imagine it depends on what part of America you're thinking of.

Australians do regularly visit NZ but it's still a long plane trip away so it's the sort of trip where you'd want to be spending at least a few days over there to make it worthwhile. I would guess this is closer to how the southern US states might view Canada. I don't think it would compare with the parts of the US that are within day trip driving distance of Canada, and particularly not those in towns right near the border.