Unfortunately, there is no good route from the FV to YVR other than what you took (no controlled-access highways).
If you try to stay on the highway, you would have run into congestion at the Port Mann bridge (mornings or afternoons). It's possible to exit in Surrey to get to the airport via the E-W connector in Richmond but that's messy (all suburban roads through the 3rd largest city in B.C.).
If you got over the Port Mann bridge, you'd have to get through some combination Coquitlam, New Westminster, Burnaby, Vancouver and definitely Richmond to get to YVR with the rush hour traffic. It wouldn't have been any easier.
One possibility is to turn south at Langley and head west on zero or 4th Avenues (or is that street) that parallels the border. Unfortunately these roads are posted with a very slow speed limit (50 km/h?) but are mostly traffic-free.
[This message has been edited by terenz (edited 06-13-2002).]