I'm a GSE student. And I'm assure you that the first semester courses are not that difficult. As it for second semester, well, you can choose. The standard choice for PhD enrollment is adv micro, macro, metric methods. However, you can substitute one of them with field courses, which are excellent!
As for micro part, we have increasing strength in behavioral/experimental economics. We also have some reputation in network. For other parts, hum........it's hard to say. I mean, we have some faculties doing labor, public, urban, political, but none of them are big names yet.
Finally, I would like to comment on the structure. The structure here is super flexible. You can simply avoid doing advanced macro in your 2 years if you are not interested in them. Just choose standard master macro and then acing the exam. The whole point is to get more than 8.5 in your first two semesters. But I believe 8 is sufficient if you took adv micro+macro+metric method I in your second semester. Or if you get super grades in field courses, I think it will also do.
Talking about the stress. I don't think it is that stressful here. You can always find some weekends go to the beach. But the real stressful thing here is rarely do people speak English! But most speak French, so I guess if you come from French speaking part of Canada, you will be fine. Well. I don't have much to comment on now. Hope that helps.