Thanks Amanda--- all very good points! And I know we would LOVE WL.
The problem is I'm not sure I can sell DH on them... he has his heart set on Poly as the main stop.

He went there as a kid with his parents and it's his "dream" to take his kids back.
I'm leery about us all in one room too for any major time frame- looking at doing CL so there's the option of the lounge for more space and entertainment options.
We don't usually stick around MK (or Epcot) for fireworks unless there's EMH afterwards, and then we stick that out until the end, so the traffic isn't as bad. But the last time we did all this it was without the baby---- sooooo, that has to be factored in.
She's pretty go with the flow for the most part, but August and the heat and being 2... well, I'm not counting on her being the best late night traveler! But that's also why I wanted Poly- to be closest (and easiest with monorail- not interested in CR) to get her home if we need to get out earlier than the other kids.
It's going to be a pain, no matter how we work it out I suppose.
I may have to lay this out with DH and give him the WL option. It's not a hardship at all to stay there- we love it. But he's just kinda set on Poly. We have stayed long term in a one room situation before and it's not horrible --- but it's not ideal for sure.