For us, it really is worth it. There is a limited breakfast in the morning, coffee, soft drinks and water available all day, snacks in the afternoon (my kids love the PBJ uncrustables at the Poly), appetizers in the evening, desserts, along with wine, beer and cordials. The lounge also served as a place where DH and the boys could relax in the afternoon while the little girls napped and where we could relax with a glass of wine in the evening. Having breakfast available in itself made it worth it for us! DH and my middle boy are early risers, they would get up, go eat while I got everybody else up and ready, then I could send each of the kids to the lounge to eat while I got ready, it was a convienence we felt was well worth it.
We did take advantage of the pre-planning services, but what was especially helpful was that there was always someone there to help with last minute reservations.