Heya! I'm going into second year and commuted to Mac (from Mississauga, 45 or 90 minute commute depending on if I had someone to drop me off at the bus stop)
I've gotten different opinions from different people regarding commuting. I know one person who couldn't stand it, but most of us are pretty okay with commuting so it really depends on the person. You save a lot of money, but I guess (if you care for it) you can miss out on that on-campus and more-involved magical "fIrSt-YeAr ExPeRiEnCe." (Don't get me wrong - you can still have a magical fIrSt-YeAr ExPeRiEnCe if you commute!! Depends on the person.) It seems like people who live on res first year feel less inclined to commute the next year (unsure if they can handle it) and often choose to live off-campus (staying in Hamilton).
Commuting is manageable, lots of people do it, you might hate it the first week but you adjust (the bus ride actually became a nice break for me). It's not as convenient if you have early classes, or if you wanna join lots of clubs, and staying on res usually helps you with your social life.
Hope this helps :)
all say thanks to tigeatoray for this post.