Good rule of thumb for transborder is to arrive 90 minutes before your flight - So the earlier bus cuts is pretty fine. Of course you could just breeze through, but you never know, particularly if there is an accident on the highway down, which is not uncommon.

The lounges in the transborder area are the Air Canada Maple Leaf Lounge (obviously not an option) and the Plaza Premium Lounge -

http://www.yvr.ca/en/shopping-dining...a-premium.aspx