For drugs, you can grab a supplemental private drug for around as $50 dollars a month (most employers cover this). $100 a month in all for a family if you want dental included (again, most employers cover this). If employers do not cover it anyway, you normally get paid much more than plan cost in lieu of the plans.
BUT, my province has catastrophic drug coverage. Its free. I have a deductible of around $2500 out of pocket, and if I go over that, 100% of all costs are covered (it steps such that 70% are covered after a certain amount). Basically, if the system fails you, they pick up the tab, and its income based too (for some people, its only a few hundred out of pocket).
I couldn't be any more happy with the drug end, to be honest. Its called Fair Pharmacare:
http://www.health.gov.bc.ca/pharmacare/plani/planiindex.html#7 (would of been cool if the US did single-payer catastrophic in their "reform" as an incremental)
As for Canadians going to the US for treatment, Ill let health care tourism stats speak for themselves. Canada has very few actually. The US on the other-hand has massive health care tourists. I think that speaks volumes. On a statistic level, far more people proportionally seek care abroad who live in the US than those who live in Canada (I don't have time to reference info, but Google is your friend).