First off, I must say I love the Westie avatar picture, we have 2 Westies ourselves.
Secondly, we just returned last night from an 8-night stay at the Poly. We headed to the MK twice for the Halloween party during the time that the resort monorail was unavailable. We did take a boat and they were using larger boats (ones you can roll strollers and wheelchairs on) to handle the crowds. The boats came every 10 minutes or so. We had to wait to board a 2nd boat on one trip over and the 2nd trip we had to stand.
You can also walk to the TTC and board the express monorail or the ferry boats which may be faster than taking a resort boat launch depending on what building you are in and how many people are waiting in line on the boat dock. Let me know if you have other questions. Have a great trip!