If it were me, I would move the car. Not because of the parking fee necessarily (I have an AP, so I never think about the parking fee) but just because I know how tired I am after
MVMCP and the idea of trying to get back to DTD just wouldn't appeal to me. I'd rather take the ferry to the TTC (I don't like the monorail ramps at the end of the night either) and a tram to the car. Even if I had to pay, it would be worth it to me.