Sean: If one were making a trip to Canada to see only the 'must plays', (ie. Doak 7+) the list would be pretty short, imo. St. George's, Hamilton, Highlands Links, National, Toronto, Capilano, Banff, Jasper.
But, there are plenty of very good courses not far behind that are well worth seeing, and the diversity of geography in Canada creates so many different looks. All 100 courses on that list are not worth seeing, but at least half of them are, and at least a few others that didn't crack the list (ie. Kawartha).