I graduated from BCIT and I went to the Burnaby Campus. I think the Burnaby campus is mainly for diploma program and downtown campus is for certificate program. It's not that easy to park in the Burnaby parking lot because there are a lot of cars. I always needed to go early in the morning in order to park close.
Although Burnaby parking is cheaper than downtowns, sometimes you need to park very far away and so far that it might take you 10-15 minutes walk to the main building (if it's snow and slippery)