Crystal Palace - had breakfast PS, got seated 1 or 1.25 hours late. It was raining hard and no one wanted to leave the shelter of the restaurant.
Le Cellier - had dinner PS (part of the Candlelight Processional Dinner Package), got seated after about 45 min wait. Missed Illuminations.
Only other long wait was RFC at DD - no PS (they don't take them) and we waited 1.5 hours. Never again.
We have been seated earlier when we showed up closer to 5 for dinner and our PS was closer to 6.
Having an earlier PS is better than a later one. As the meal backs up, you get seated later and later. People want to wait for the characters, so they don't leave right away.