There are a lot of similar rides, especially when you compare Disneyland to the Magic Kingdom. But, there are attractions that are unique to each. And, there are differences even in attractions you may find at both parks. Pirates at DL has bigger drops and starts by going through the bayou before you get to the pirates area. The Indy ride at DL is similar to Dinosaur at AK, but with a different theme. But, to say that you can experience the equivalent of 4 days at WDW with 2 days at DLR... just not a valid comparison, IMHO.