When we went in December with our two-year old and his 52-year old grammy, we went in with the plan to take the break at lunch and head back to the cabin to relax. Plus, with our two-year old in daycare, he's on a very tight schedule and he needs his afternoon nap.
But once we got there and tried it the first day, we realized it wasn't going to work. He was all about the "Mouse" and he didn't want to have no part of being back in the room. He didn't take a nap that first day and we ended up just sitting around the TV watching the parks channel.
We decided after that day we'd just go with the flow. He ended up napping at the right times for us, because while he was napping, we were able to do the rides/attractions that didn't really appeal to him. And grammy loved to just sit with him on the bench watching the people go by (my mother is a watcher, not a doer LOL).
Now, if we went during the summer months, we'd have likely enforced the mid-day break, just to get him to relax a little. Maybe a swim in the pool, or a quick nap, or even just a snack (we really enjoy eating in the parks).
During the "winter" the weather wasn't bad and spending a whole day in the parks wasn't too hard. Of course, some of the parks were closing earlier back then, so that also convinced us that it wasn't worth fighting the FW transportation.