I used to take the GO train back from Burlington some nights, and the 11:14 train out always has a VIA train go by about 5 minutes before it shows up. Even when you see it coming and you've braced yourself, it's still a pretty big gust of wind and a pretty loud sound. Someone who is less stable on their feet could definitely be toppled over. So yes, I would agree that VIA trains blowing through GO stations at 105 km/h is definitely more of a danger than at-grade crossings.
It always kinda miffed me how people could get hit by a train at an at-grade crossing. You'd think that if you were going to cross the tracks, that a quick look both ways revealing a bright light coming at you would probably be an indication that you shouldn't cross.