Hi! I'm also applying to UofT and also have some research experience (SickKids and Health Canada) :)
UofT's admission process is definitely very comprehensive. They do put a lot of weight on research/volunteer experience, references, and diversity of your undergrad program (the more diverse, the better). So if your GPA isn't the strongest, then the other parts of the application make up for it. I like this better than schools that only look at GPA. Just because you have a high GPA doesn't mean you will be a good RN or succeed in the program. The other parts of the application show that you are actually interested (and thus more likely to succeed). I just graduated this year with an undergraduate degree from UofT and I can tell you that they put A LOT of emphasis on research. The profs basically expect everyone to go to some sort of post-grad program. People kill each other for research opportunities here lol. And getting a good research opportunity is like winning the undergrad lottery haha. So I think UofT wants students who they think will contribute to research as an RN, be motivated enough to gain additional certificates, get a masters/PhD, or just anything to be an RN with a great resume (if that makes sense lol).