You're referring to the platinum package plan, which is not a
Disney Dining Plan. It includes many other components besides dining.
The Platinum package plan includes:
Breakfast, lunch and dinner, plus two snacks, per person, per night. Available 100 Walt Disney World restaurants (includes tax but not gratuities, unless otherwise noted).
One resort refillable mug per person
Unlimited selected recreation, including Golf, Miniature Golf, Water Sports, Archery, Tennis, Guided Fishing Excursions, Cane Pole Fishing, Horseback Trail Rides, Pony Rides, Carriage Rides, Horse-Drawn Wagon Rides, Bike Rental and Watercraft Rental. Some restrictions may apply and advance reservations may be required, and are suggested.
One admission per person to Cirque du Soliel La Nouba
Unlimited use of Disney Children’s Activity Centers
Unlimited admission to selected theme park tours
Preferred fireworks viewing areas for Wishes at the Magic Kingdom and IllumiNations at Epcot. ( Advance reservations are required at least 24 hours in advance and voucher is required.)
One portrait session and photo package with professions PhotoPass professionals
One Disney’s Photopass CD
Private in-room child care (4 hour minimum, 6 hour maximum, gratuity is not included)
One selected spa treatment per person
Fireworks cruise (one per reservation, everyone on your reservation is included)
Reserved seating at Fantasmic! (one per person)
Nightly turn-down service
Personalized pre-arrival itinerary planning
Richard Petty Drive along experience
Exclusive keepsake (one per room)
Also, it differs from the Disney Dining Plan in the dining component. You receive three meal credits per night. All restaurants, even signature restaurants, are one credit on the platinum package plan. A number of restaurants that don't accept the Disney Dining Plan, even Victoria & Albert's, are included.
All this will cost you (in 2010 - don't know what the price will be in 2011) $220 per night per adult. If it's a short trip, you may not be able to fit enough in to get your money's worth, but that's up to you.
You should probably keep in mind that trying to fit all this in might also mean less time to spend in the parks.