It depends a lot on which building you are in at the Poly. Some are verey close to TTC. You would probably NOT want to take the monorail from the Poly to the TTC, as it is 15-25 minutes depending on how buy they are. However, coming back you could easily switch from the Epcot monorail to the Resorts beam and only have one stop to go. If it is a decent day I would suggest the walk to the TTC from the Poly rather than driving.