I feel very strongly about this! You need some adult time, without your kids. You know you love them and you would do anything for them, but you really need to have fun yourself sometimes. It would be different if you never took them to Disneyland.
Think about it logically: when you go to DL with kids, you are constantly thinking about them, what they want, need, are they happy, are they hungry, are they sleeping ok; will they go on this ride, are they too wiped out to walk any more... on and on. Vacation with kids is NOT really vacation for parents!
Another thing: I love my 3 DDs dearly, but they can SMELL guilt, like dogs smell fear! You need to not apologize for your trip. They will be just fine, and so will you. You can bring them back some nice surprises, but don't let them whine that it's no fair... YOU ARE ENTITLED TO SOME ADULT TIME!
Think about it... have some quality time with your sweetie, ride what you want to ride (no baby swaps! No riding Heimlich's Chew Chew Train, unless you want to!), eat what you want to eat, (no "Ewww, that's gross! I don't want that!") stay as late as you can stand it... have a drink in the Cove bar... go back to the hotel and do what you feel (wink wink) cause you're not sharing a room with the kiddos!
This is not a bad thing, people. This is a GOOD thing! Your kids are more strong when they see parents taking time for their own relationship. You are not being selfish. Please go, don't feel guilty, and have a wonderful time!
Ok, I'll get off my soapbox now!