We did this earlier this year and it accidently worked out that we were able to see Illuminations from the restaurant. I had made an ADR with plenty of time to be done eating and out of the restaurant in time for Illuminations. They were SO far backed up on getting people in that by the time it was our turn, we ended up sitting outside and seeing Illuminations from the restaurant. I'd say give yourself a LOT of extra time and chances are you'll still be sitting there for the show. Don't forget to request outside seating when you check in.