I agree with most of what you say. Pretty much all Canadian teams have rabid fans, but I would agree that Leafs (or Habs) fans are probably the most passionate because those teams have so much history.
I would disagree that all of Canada goes nuts for the Leafs though, they're a very polarizing team - you either love them or hate them. Around here, the vast majority of people despise the Leafs (and everything else about Toronto really), but you still find the hardcore Leaf fans; however, I would not describe it as "pandamonium" here when the Leafs are doing well. Out East in Ont. and the Maritimes though, I have no doubt that that is the case.
What do you think about the talk of putting a 2nd team in the Toronto area?