Sit down meals definitely take up time, and back when you got special meals (2008) it was worth it. These days because of my allergies (which makes counter service risky) we do a 2pm last lunch reservation of the day sit down meal at one of the monorail resorts. Typically we finish around 3:30/4:00, just in time to get into the park. Grand Floridan Cafe is great for this, but I'm hoping to try Steakhouse 71 to our next trip. The trick is to eat enough 'lunch' to keep you from getting too hungry during the party when restaurants are closed but not to overeat and feel gross in the heat. For us, that's usually a high protein salad.