Quote Originally Posted by buzznwoodysmom View Post
Park your car at the TTC and monorail to the Poly then to the MK. Then you can get back to the TTC when MK closes. There is an issue at the Poly with guests doing what you are suggesting, parking there while they go to the parks. This causes a parking shortage for those who are actually staying there. Nothing worse than coming back to your resort and having to pay to valet because there are no available spots.

This is why Disney has the 3 hour parking rule, which has not always been enforced very well. Not sure if they have gotten stricter since the new parking fees have come into play.
Hopefully, not responding too late! I would suggest walking from the TTC to the Poly if you can. Otherwise, I believe you have to go through the TTC security line, which may take quite a bit of time. If you walk to the Poly, have dinner, and then board the monorail there for MK you will go through the security at the Poly before boarding the monorail, which is super fast.