We went during that week last year- it was crowded but nothing like when we went this past Christmas. Something else to consider- during that week the opening times were 1 hour later - so a 8am early entry and 9am regular opening. We were off site 2 nights then on site 2 nights. Our usual strategy still held - get there as early as you are allowed (EE time or rope drop) and stay until you see the hoardes coming in (I think it was around 11:30am that week versus 10:30 during the week before Christmas), then grab lunch or see a show, go back to the hotel, and lay low until late afternoon. The local AP's didn't get unblocked until the following week so there weren't too many flocking in late afternoon.
Regardless of when we go ("ghost town" or f'orget about it") we always make the best of it and have a wonderful time. Even when we went on a Sat night during that August trip, and Tomorrrowland was wall to wall people, we stood in a 30 min Buzz line, then did some shopping and got out with smiles on our faces.
Now, if the LA schools are not in session yet and DL still moved the open times out an hour, defiantly try to get there as early as you can!!!