I have no advice for you on restaurants, sorry. My family usually try to avoid the expensive food. But when I do my own Disney vacation, I will definately try the food. I've only ate at the Tiki Bar and had french fries and clam chowder at DLR.
ANYWAYS, as far as WDW attractions that are also in DLR, some themeing are different but the ride experience may be the same. It depends, but here's my opinions. I think a lot of this may be SPOILER so I will put on SPOILER ALERT. Besides, I never tried SPOILER ALERT yet :
OR you can just check out WDW's website and compare/decide. There's also this: http://www.themeparkinsider.com/ and many more sites you can look up from google.com
1) Haunted Mansion: WDW's stretch room is not an elevator. There's a neat surprise in the graveyard before you enter the stretch room. The changing paintings and staring busts are part of the ride, not a walkthrough. The mansion and entrance to the ride are different. They are in different lands. Big Thunder Mountain: DLR's has a earthquake theme. WDW's has a flood theme. I HATE THE BARN STYLE QUEUE IN WDW'S. It was really uncomfortable. WDW's feels more tame than DLR's. Different themeing. Fantasyland keeps the "fair" look. POTC has different themeing, in a different land, different show scenes. And you don't get to "go up the waterfall". Didn't go in Country Bears. I would expect it to be the same. There's an Aladdin spinning carpet ride with spitting camel. Jungle Cruise has a different ending. Tiki Bird: Under New Management is different. I found it okay, most people don't like it. Instead of Mickey's Toontown, there's Mickey's Toontown Fair. Gadget Coaster is themed to Goofy's Barnstormer. They have Philarmagic, we don't. I hear it's really good. Autopia looked really plain, so I didn't go on it. They got PM. Stitch's Great Escape is getting mixed reviews, but I'd try it out. Buzz Lightyear is a bit different, they have more queue and attached guns. WDW's Space Mountain I think is a copy of DLR's Matterhorn. Splash Mountain has side-by-side seating. Not sure of the ride itself. Splash and BTMR are in the same land.
2) EPCOT's Soarin' experience is same in DCA. But themeing is different. Malestorm was broken when I went. Didn't see the China, France, and Canada movies. Didn't see America AA show. Illuminations is amazing! MUST-SEE. Test Track is neat. M:S was still being built. Body Wars uses the same flight simulator tech as Star Tours but seems bumpier. Lots of little attractions in that pavilion. Universe of Energy was neat. Didn't know where HISTA was. Try Journey to Your Imagination with Figment, it's interesting. Completely different theme of course. THE LAND is a boat ride through a greenhouse. Circle of Life was a movie about conservation. LIVING SEAS is like a big aquariam. Turtle Talk should be, well, technicially the same with different seating.
3) Star Tours themeing is different. But the ride experience seems the same. DLR Fantasmic is better than WDW Fantasmic. They use different segements. WDW's seems longer because they use more of the water screens. WDW's TOT has more themeing I think and has the "5th dimension" missing in DLR's. I didn't enjoy Disney-MGM's tram tour that much. USH's is better. I think Muppet Vision 3D has a slightly different theme, but same experience. The Great Movie Ride was cool. Check out the technology used on the ride vehicles. Indy show is awesome. Sounds Dangerous was all right, basically sit in the dark with hi-tech earphones.
4) DAK will have Expedition: Everest by the time of your visit. Dinosaur! uses the same tech as Indiana Jones. I like Indy a whole lot better. In Dinosaur, you can't see much. Festival of the Lion King is cool. ITTBAB show is the same, themeing is different. I don't know what is replacing Tarzan ROCKS!, but that was a cool show. There's a bunch of nature trail/ animal viewing. It's neat. But a lot of people say they can do that at zoos. There's a Rapids ride I think in Asia, that's cool.
Definately check out all the parks' parades. I didn't see MGM's Beauty and the Beast show. EPCOT's China had acrobatics.
WOW, it works. But now I have a big black box! LOL.