Your safest bet is to not plan on watching Illuminations from a restaurant. The only table-service restaurant with any signficant number of tables with a view of the show is Rose and Crown, but it is still only a 30% chance. (We've been extremely lucky, getting a view of the show three times out of eight times we've had dinner there.) There is a counter-service eatery in Mexico with tables with a view, but you need to camp out there a couple of hours before the show. Too much wasted time for my tastes, and I cannot really enjoy myself while people are coming over ever five minutes asking if we're done with the table yet.