While I understand where Carol is coming from, my impression has been that if you're **valet** parking at a resort, staying a while longer will not be a problem, particularly since you will be at MK during what aren't regular park hours.
If you're doing a "classy dinner evening", I think the valet service adds a touch of class that the TTC doesn't. Under these circumstances, I don't think you'd be wrong to valet at the GF.