I'm just wondering what YYZ is like at night? My flight would be due to arrive at 2245. This would be a Monday evening. What would Immigration/Customs/Security be like?

Additionally, would it be better to just stay the night at one of the airport hotels or would it be better to travel downtown. How long would it take to get downtown at this time? FWIW, I'm only staying in Toronto Monday night and maybe Tuesday night before I move on to a city an hour outside Toronto and as it was a long haul flight, just using the time in Toronto to recover and maybe get a sense of Toronto for other visits.