I live in SF and I've met about a dozen engineers who were studying or studied at Waterloo. 100% of them had no desire to work in Canada. They all had the same thing to say, as much as they love Canada, salaries suck, and so do the taxes.
Has something changed recently or did I misinterpret what you meant?
Also, at least circa 2012-15, Microsoft's immigration lawyers would recommend going via the CBP border post in the San Juan Islands or Port Angeles (take the ferry from Victoria to Seattle) because they'd just wave you thru with little to no hassle. The CBP post at Surrey/Blaine would tend to grouse you more.