There are a couple of fast food rests as she turns right, before reaching the trans border arrivals area. I have done this walk many times and, as suggested, its real easy.

IME, the reverse is more complex. Once you cleat US Pre at YUL, you walk through a labyrinth of hallways before reaching your gate. (Whomever designed it was on something). One time, I discovered chairs stored in one of these long paths.