Hey Kevin, that's a smart move.
We did this same thing last summer. We live in Seattle, but found a much cheaper fare out of Vancouver, BC. So googled "park and fly, found a decent hotel near the Vancouver airport that also offered free parking while we were in Europe, and booked one night. We drove up the night before our flight, parked the car, had a good night's rest, then took the hotel's shuttle to the airport and comfortably caught our flight with no stress.
Even with the hotel/parking cost, our little family of 4 came out about $1200 ahead as opposed to flying out of SEA. Probably more, as we would have had to pay to park at Seatac anyway! Added bonus, the food and sundries we bought at YVR in CAN$ while awaiting our flight were all on sale compared to what they cost in US $ (at the time, the exchange rate gave us about a 30% discount... : )
I'd do it all again in a heartbeat...