Different! Not better or worse, just different!
I grew up going to DL, and have spent the last 7 years going to WDW, Just 3 weeks ago I made my first trip back to DL since 1999, when DCA was under construction. The addition of the Downtown Disney area (while nothing like the WDW one in scope), has given the area a much more WDW feel, especially if you were to stay in one of the "on property" hotels.
Disneyland park is NOT the Magic Kingdom. In my opnion, the Magic Kingdom captures the feel of Main Street U.S.A., and does a fine job in recreating much else about DL, but does not fully capture it, which is fine, nothing could. There is a magic to DL that is unlike anything else. As for attractions, here are a few that either don't exist in WDW, or differ, that you will enjoy:
Indiana Jones and the Temple of the Forbidden Eye: (amazing attraction, my all-time favorite Disney attraction)
Small World: (techincally the same, but the building and Topiary make it a more special experience.
Pinocchio's Daring Journey
Snow White's Scary Adventures: (not the same ride from WDW, although very similar. MUCH SCARIER!)
Alice in Wonderland
Matterhorn Bobsleds: (Old School, but great)
Space Mountain: The ride feels and looks great after the LOOOONG rehab
Haunted Mansion: Mostly same on the inside, but outside is beautiful
Pirates: I had forgotten how much better the DL one was. The one in WDW seems silly after I rode this one again.
Mr. Toad's Wild Ride: Nothing needs to be said
Roger Rabbit's Car-Toon Spin: Great dark ride in ToonTown
Storybookland Canal Boats: Hard to explain, but a must-do if you are a true Disney fan.
There are problems sure, like crowd control in the more confined spaces of DL, but you will love it.
Go to DCA with an open mind. I enjoyed the park a lot, but it lacks a lot of Disney feel.