I don't work in the urban planning program at UBC (I work in an unrelated department), but my understanding at the university was that the number of applications has pretty much been normal.
This recent article from the New York Times seems to imply that top programs are experiencing a surge in applicants because they have waived testing requirements (SAT, ACT, GRE, etc.): https://www.nytimes.com/2021/02/20/us/colleges-covid-applicants.html
Standardized tests aren't really a thing up here, so I imagine things are more or less the same. Canada tends to see a surge in applications depending on the US political situation. There was a big spike after Trump was elected (US students looking to get out), but that won't be the case this year.