I've never had a bad experience going into Canada by land, often I'm not even asked any questions. About 75% of the time I'm interrogated when going into the US (even with GE) by land, I've even had personal insults from a clearly homophobic CBP officer (which pissed me off so much that after the interrogation, I did a uturn in a gas station and went back to Canada. I haven't crossed the land border since).
Crossing into the US by land is such an ordeal now, I'd rather spend my money in Canada. Fortunately it's not much of an inconvenience for me as I don't live that close to the land border anyway. What makes it more laughable is that when I enter the US by air I'm not asked a single question.
While the figures don't support it yet, the unwelcoming attitude of the US (and in particular CBP) is bound to effect tourism in the long term. I know so many people who have had bad experiences.