The park technically closes at 9 which means they will stop admitting people to shows and rides at that time BUT Illuminations will take at least another 20-30 minutes and some of the stores stay open later than that (Mousegears last time I was there and the camera shop under Spaceship Earth) so you will still have time to eat your meal. It should be served just like any other meal if not a little more 'timely' I dont see your entree's taking a super long time to get fixed or anything b/c the employees will be ready to get shut down for the day. On your way out of the park it should be emptying out if not empty so it may be a good time for some pictures of the attractions lit up with no crowds in them, but you may not be allowed to meander around everywhere pretty must just toward the exit
Hope this Helps!