The biggest culture shock for me, an American in Toronto whose diet consists basically of Mexican and Indian foods for 90% of my meals, was the lack of options for a decent lunchtime burrito.
The burritos here are pretty good; Mucho Burrito lies in the acceptable range somewhere between the cardboard-y Z-teca and the excellent Burrito Boyz.
The lines and seating situation at FCP at lunch is ridiculous though.