We attended our first
mvmcp when our two children were 3 and 2. We loved it! The parks were not crowded, especially in certain areas. We enjoyed seeing so many characters all decked out in their Christmas gear. We rode several rides over and over because there were not lines. Now, I'm not talking Splash Mountain, here, because again, my children were little. The longest lines were for pictures and hot chocolate/cookies. But still, they weren't too bad.
How we handled the fatigue factor was just not spending all day in the parks. I think we all took our longest nap that day. Then, we headed over to Liberty Tree for dinner. We loved it. Again, characters are dressed in Christmas gear. The fireworks are spectacular at this event as well.
My children (and I) loved the parade! It was special because it was different. Then when we got home, we watched it on Christmas day with new eyes, because we had been there for it.
I would definitely recommend it. We would definitely go again, but this year are trying our first
mnsshp.

BTW, Hubby and I were surprised at how late our children stayed up!
Another thing to note, we went the first week of December too, so crowd levels may be similar to our experience for the mvmcp you're looking at.
Enjoy!
Joni