Hi Leslie,
With a 2 year old, you will be thankful you are staying at the Poly. Imo, no other resort can compare as far as transportation options. I do not believe there is another resort within walking distance to the TTC, which has the direct monorail to Epcot. With two ways to get to MK (boat launch and monorail), you can't go wrong.
The noise can happen at any resort. I have had noisy neighbors two out of the four times I stayed at Poly. You can find noisy neighbors anywhere at any resort. Some resorts are handling it better than others.
While some posts may seem to be negative reports about certain resorts, the posters are just relaying their experiences, which are upsetting for them after spending all that money on a vacation and having high hopes for their WDW trip. I think we all romanticize about how wonderful it's going to be. Then reality hits - long lines, heat, and unfortunately worse things like getting sick, having your resort stay ruined by other things (like neighbors keeping you up at all hours), or *fill in your reality here*.
When you have to deal with something particularly irritating such as noise or problems with your room, when it goes on and on with no relief, your tolerance level goes down with it.
I'm glad we are able to share all our experiences on this board, the good and the bad. I always find it interesting how some of the problems are solved (or not solved). Here's hoping you get lucky as far as neighbors go, because the Poly is a wonderful resort for families with small children.
Tink