Oh yeah!
We were there last year and this year and I highly recommend PS for all park sit-down ones and popular resort restaurants(all character buffets, ie OHANA, 1900PF dinner, Flying Fish, Spoodles). We did find that the many restaurants of the Swan and Dolphin were usually able to accomodate walk-in and you can call the restaurant directly(without the PS system). It was and extremely busy time and if you really want a restaurant..get a ps. We called at exactly 90 days for New Year's Eve at Brown Derby. Many restaurants were not taking any walk-in that week.
Connears