If you're really trying for Illuminations view, you need a 7:15 or 7:30 reservation time, and order slowly (beverage order, then peruse menu for awhile, etc. to stretch out your table time.) By 8:00 PM all of the tables in the window-dining-room will be full and no one will budge from their seats until Illuminations is over.
If you are lucky to get a table AT the windows in the main dining room, the view is very good. However, the rest of the tables in that room vary from OK to mostly obstructed views. And 1/3 of the restaurant is no view at all. They do turn the lights down very low (too dark to see your food)and pipe in the Illuminations music. You are allowed to get up from your table and walk into the back of the main dining room to watch from there if you like, but that's a really lousy view.
When you check in, ask for a window table in the big dining room..we made the mistake of just asking for a window table and were seated right next to the window in the side room..with a view of nothing. So much for perfect timing, etc. Though we liked the food I would not try this place for the view of Illuminations...if you really want to see Illum.and eat here, get a 6:30 or 7:00 meal, and after you eat go find a good spot along the top of the World Showcase to watch Illum.