I agree, switching to the Grand Californian will give you the full Disney immersion or the other two on-site hotels, but GCH is my favorite and the only on-site hotel we stay in.
Do you stay on-site at WDW?
I grew up going to
Disneyland and recently visited WDW in June. We loved it and we will be going back in May 2011. However, WDW and DLR are different. WDW is huge, lots of things to do, different parks to see, but the downside is the distance of the on-site hotels to the parks. Rides are spend out over many parks.
Disneyland is quaint and has much more detail and character than the Magic Kingdom. DLR is most like the Magic Kingdom, but much better. If you did compare WDW to DLR, DLR also has more rides in it's smaller area than any of WDW rides. DL Space Mountain is so much better than the Space Mountain at WDW. Our kids say that WDW Space Mountain is lame. DL also has the Indian Jones ride, which is awesome and WDW does not have the ride. Small World is better at DL and Peter Pan is also a must do at DL, because WDW Peter Pan is not as good either. DL has New Orleans area which is unique and special. Fantasmic is also hands down better at DL than WDW. The two can even be compared! Churros are also much better at DLR than WDW!

Not to mention the weather is better than the hot, humid weather in WDW!
Disneyland is special because it is where the dream started. Walt hand prints are all over Disneyland ( figuratively speaking.) Disneyland is dripping with Walt history...you may be able to ride the "Lilley Belle" Walt's private train car.
California Adventure is also unique and WDW does not have California Screaming. But you will find Tower of Terror, TSM, Monster Inc, and Bug's Life at DCA. WOC is a must see and there is not anything like it in WDW.
Our favorite parks at WDW are Epcot and Animal Kingdom. The kids loved Rock and Roll Roller coaster, Mission Space, Expedition Everest, and the Dinosaur ride in AK. However, they did not like the Magic Kingdom, and did not think it was a nice as DLR. They did miss the Indian Jones ride and Space Mountain ride at DLR.
While we were in WDW we stayed at Bay Lake Towers and Animal Kingdom Lodge. We loved both resorts but BLT was our favorite. However, neither one of those resorts could compare to our Grand Californian Hotel with the amazing park view and easy, fast access to the parks. You are literally in the parks in a few minutes. It's all about location, location, location. I would definitely stay on-site at the Grand Californian to give you the best experience. Stay off-site in my opinion would not be the same.
Both WDW and Disneyland are each special in their own way. DL is not WDW, nor vice versa. Enjoy each park for what it is, each having special attributes. We love WDW and DLR, each has something unique to offer. Just remember in the end it is all good because it's all Disney!
Some suggestions:
-If at all possible John Wayne Airport will be much more convenient and you will not have to deal with the horrible freeway gridlock traffic. If not be prepared and don't get discouraged with traffic.
- Stay at the Grand Californian with a park view or pool view
-Think about eating at the Blue Bayou a Disneyland Classic and be sure to make a ressie
-Have a corn dog and bowl of chowder in DCA
- Get a Tigger Tail in DLR
-Eat a Disneyland Churro
-Have a Dole Whip or Float while watching Tiki Room Show
-Buy a loaf of Boudin Sourdough Bread and read the history about it
-Take a picture of front of Club 33
-Have a loaded Baked Potato at Troubadour the CS is nothing special but they make a good baked potato!
-Take the tour "Walk in Walt's Footsteps"
- Fantasmic, Aladdin (in DCA) and WOC are must sees
-Since you will have a car, check out the Garden Walk and eat at the Cheesecake Factory.
-If you want a signature meal "Napa Rose" at the GCH
- Storyteller's Cafe is also a good TS restaurant at GCH
-If you stay at the GCH you can see WOC from the special GCH platform. It will not be as good as seeing it from the designated area in front of WOC, but it is a good alternative if you aren't up to waiting in lines, etc.
-Use the special entrance into DCA from the Grand Californian Hotel
-Lastly, enjoy your trip you are going to visit the place where it all began!
