score:3
I always use Park N Fly Valet at YYZ. I used economy once. It wasn't scary or dangerous, but it added a fairly significant amount of time on both ends of the trip waiting for a bus, as well as walking through the lot. With valet, my only issue is that sometimes I have to wait 5 or 10 minutes for my car to appear. (Every few years it's more than that and I become a VERY unhappy customer at them.) Usually, my car is there, waiting for me (and the engine running in the winter so the car is warm) when I get off the bus. I have never had an unfriendly driver, though I have no need for them to be friendly; I just need them to make the bus go where I need to be. Park N Fly coupons and coupon codes are easy to obtain; I get one on my web-checkin boarding pass whenever I fly Air Canada. On a recent trip for a week (Sun-Sat) it was going to be $136 and the coupon took $55 off that.
With the advent of the UP, you could construct a public transit solution where your car is at a GO station, where parking is free. You could also book a room at an airport hotel the day you leave, typically for a little over $100, that includes two weeks of free parking and use the hotel shuttle. But for a 5 day trip, I'd say go Park N Fly and find a coupon code.