While you'll find a lot is different a lot is the same. I'm reading a lot of TRs from WDW vets who have gone to DL recently, the biggest thing they all seem to suffer from is "castle envy" everyone seems to be astonished at how small our castle is. I never really noticed, I can see the castle at the end of Main Street at DL, I'm not sure why the WDW vets can't. But that's a major difference I've been hearing. The castle really glistens though becuase the trim is real gold.
Many of the same philosophies that you apply at WDW apply at DL, hit the parks early before the crowds show up. The only difference is that the evenings can become even busier because the locals may decide to come in after work for a bite to eat, hit a few rides, see the fireworks and go home. Also on the DL forums check out Hydroguys threads about the impact of the So Cal Annual Passholders. Since I am pretty much in the "go to the park for dinner and hit a ride or two" category, I never considered the increase in wait times for people who can come and spend their whole day waiting for a new ride. In fact I'm still hoping for my second ride on FNSV because the lines are still so long! But he has some good points, when the So Cal Passes are blacked out, you'll have a better chance of going on the newer rides.
I love the quaint feeling of the park compared to MK, and while it's a pain to stake out a good spot for Fantasmic, the way that the show springs out of almost nowhere is so much more magical than the arena they created at DHS for the show. The fact that they incorporate the existing attractions (Mark Twain, Columbia, Tom Saywer's Island) makes it really magical. If you don't want to wait on the ground see the second show if they offer it, less time to wait or spring for the Dessert Buffet and you have no wait!
Check out the TRs on the DL Forum and don't miss the "My Disneyland dining reviews, with pictures thread", you don't have to read all four years of it, but start around page 86 at least. DL Vets seem to agree that Cafe Orleans and the Monte Cristo Sandwich, Pomme Frites and Beignets are a not miss. I also love the French Onion Soup. That entire meal one of each will be plenty for two. Other favorites are the Baked Potato Soup from Carnation Cafe on Main Street, and the Tigger Tails from Pooh Corner though I can't speak from experience on the last two. I would recommend the Napa Rose for a wonderful elegant meal and in a few weeks I can tell you about Steakhouse 55.
http://www.disboards.com/showthread.php?t=1253888
One thing that I always do when I leave the park (DL usually late at night) is to look up at Walt's apartment above the Firehouse, they leave the light on because it was always on when Walt was in the park. The idea is that Walt is still somewhere in the park so they always leave the light on. I always give a silent "thank you" to him for everything that he left us on my way out of the park.
Ask as many question as you like while you plan your trip. I'm having my first stay at the VGC in less than three weeks

But I live about 20 minutes away and have been going for over 25 years. I have pictures of documenting the building of DCA and attended one of the soft opening events, these parks are like my home and now I'm so excited that I actually get to stay there even though I live close enough that I can get home in the amount of time it takes to get from the park to your car.
And once you go post a TR!