Unless you are willing to pay for valet parking at the GF ($12 plus tips), you will more than likely have to park in the lot across the street from the GF and it's a bit of a hike from there to the GF monorail station, probably farther than if you just parked at the TTC parking lot and take the tram and Monorail/Boat.
IMHO it's not worth it, unless you have some sort of special needs.
Most here will tell you it's better to take the bus from CBR or any resort for that matter to the MK, because the bus will drop you closer to the park entrance, than if you drive to TTC parking lot and then take a tram and monorail/boat to get to the MK entrance.