On other nights in hotels in the past, not just to WDW, we have been bothered by doors slamming, loud voices in the hallways, traffic from the highway nearby, etc.
I finally just brought my white noise machine, or "wooshy" as my kids called it, on every trip, and it really makes all the difference. Both my kids ended up getting their own units and bringing them to college. All of their roommates over the years not only didn't mind the "wooshy", but they ended up getting their own for when they went home for vacations or in the summer!
Now we travel with just our iPhones - there are several white noise apps, including the one that I have that has the ability to record any sound. I actually recorded the sound of my at-home unit. All of the apps are either free or less than $3.00.
We will be taking 3 short trips this year as new BWV owners (one trip will be for NYE in a 2 bedroom Boardwalk view!!) I'm sure I would have at least some concern about noise without the white sound app, but I know that we will be fine as long as we are using it.