We have went last couple years. For perspective, Skillet, Casting Crowns, Mercy Me, and Newboys have played at the Castle Stage. People stand around along the hub area. Toby Mac and Hillsong were the most crowded with people standing as far back as Caseys hot dog restaurant. Building 429, and Mandisa played the Tomorrowland stage between Buzz Lightyear and Carousel of Progress. No name up and coming groups were out by Space Mountain. It was also the overflow with a screen for Matthew West who played Tommorowland 2 years ago. Last year he was "promoted" to the castle stage.
We get there a little before 4 and once in ride rides and eat. The concerts start about 7:30 and end at 1.
There is no MSEP or fireworks unless an act does them. Skillet has both years.
It usually sells out a day or two prior. You can buy a Friday ticket or Saturday ticket for I think $59. A two night ticket cost $109. Last year if you bought the 2 night ticket before early August you got a free one day waterpark ticket.
I had heard it was very crowded and full of unruly youth groups. I did not feel either the years we have gone.