I was raised in the SF area and lived there until 2 years ago. Now, in my mid 30's I live in Phoenix. I was raised on
Disneyland. I have been there probably 100 times. I've been to DCA 10 times.
It wasn't until 1997 that I finally got to go to WDW, and I loved it! I went back each of the following 4 years.
There is no question in my mind that Disneyland is far better than the Magic Kingdom at WDW. In a post on another board, I said that most of the attractions that got their start at DL and opened at WDW later are much better than the Florida versions;
It's A Small World (It's all about the facade and the music)
Pirates of the Carribbean (Longer and much better)
Peter Pan's Flight ('83 rehab did wonders)
Haunted Mansion (both buildings are cool, DL ride is longer)
Enchanted Tiki Room (but the new one at MK is pretty cool too)
As far as I am concerned, the only exceptions are;
Splash Mountain (seems more in at MK and I don't know why)
Big Thunder (much more scenic & better at night)
Cinderella Castle (Bigger and a touch nicer at MK)
Jungle Cruise (toss up here but I like the tunnel)
Tomorrowland ('95 rehab did wonders, DL's didn't come close)
All that being said, I love the MK as well as Disneyland. It's a much larger park and it does have it's own cool things. And WDW is a much better vacation destination. It's become a pilgramage for me. You just can't compare the "resort" aspect of Disneyland to the Vacation Kingdom at Walt Disney World. Epcot is my favorite park there. I have done almost everything at WDW and can't wait to go back to do even more.
Everyone should at some point make the pilgramage to WDW. And don't worry, your love for Disneyland will not change.