Welcome Home!
We've stayed at the Boardwalk a number of times, both the Inn and the Villas, starting in 2012, and most recently in July.
Like everyone else who has commented so far, the hallways are endless. I swear, we've stayed in rooms ending in "01" so many times, it's become an expectation. After running around the parks all day, knowing that long walk is still ahead of you is definitely the worst part. And I also agree, it seems short-sighted of Disney to not have created more exits out to the actual boardwalk.
But those are the only two real "minuses" for this hotel, for us. The boardwalk area is so beautiful and I would really suggest planning to spend a little time there one evening. The entertainers are fun and very kid-friendly, and there's a movie on the lawn at night. Across the lake is the Beach Club, and you can check out their movie and activities too, all for free.
You can also walk to Epcot and come in through the International Gateway. Up to now, this has been my very favorite part of staying there, as it always felt like a "private" entrance. However, with the Skyliners now running, I know that will definitely change, and not for the better.
Everything is accessible by scooter, including the buses, water taxis, and Skyliners.
Hope you and your family have a wonderful, magical time!