What may or may not have worked for a given person on a given day at a given border crossing has little relevance to what will work for you today at the crossing you happen to be at. No matter what the regs and no matter what the internet
experts tell you, a lot comes down to what kind of a day the officer on the other side of the transaction is having. If the dog chewed his shoes overnight, his wife yelled at him as he was leaving the house and the car wouldn't start you can pretty much be assured of a bad crossing. Your attitude may influence the quality of your experience but its still pretty much a crap shoot. And good luck explaining that somebody somewhere got treated differently sometime.
Our approach is to expect the worst, minimize the possible irritants (fresh fruit, vegetables and booze in particular) and then go with the flow. We try to cross with an empty fridge and minimal booze. We make a COMPLETE list of produce and booze and when asked if we have anything to declare start reading the list. That almost invariably provokes a resigned question "Do you have any X, Y or Z?" If you think you can outsmart them and only declare what you are required to declare then be prepared to be harassed if they find something undeclared that they think should have been declared. Keep your expectations low and you may occasionally be pleasantly surprised.
I have no doubt that there have been occasions where individuals have brought large amounts of declared booze into Canada
on a variety of pretexts. I am equally certain that large amounts of declared booze has made its way to Canada Customs Christmas
parties as well.