They are now offering an 'Airport Parking Package' which includes parking and is actually cheaper than the advanced purchase rate.

In my experience the airport shuttle works very efficiently. When arriving by air, I call after collecting my baggage and the shuttle turns up within ten minutes, or less.

When I was there about a month ago I was told that a Westin would soon be opening at YVR and was even shown a building under construction, a bit closer to the airport than the Four Points. The SPG website now shows a Sheraton to open in July. I don't know if this is the same building as the supposed Westin, or if there will soon be three Starwood hotels at YVR.