So Canuck, based on what you say, there is a "different standard" for Canadians entering the US, vs. US citizens returning?

I was mentioning this thread to my wife, and she reminded me that she and a few girlfriends had gone in and out of Ontario via the busy Niagara crossing by car about a year ago, again with no issues. She was of the opinion that at any big crossing they are too busy to detain you just for the hell of it, unless you are 'acting funny'

My basic question still is; has anyone had the type of issues everyone is warning the OP about?