Well... perhaps I should add a caveat to my recommendations, then.
By all means, take in the Mansion, Pirates, etc., but as I'm sure you're aware, the WDW versions of the rides are different. In the Haunted Mansion, the stretching rooms aren't elevators, as the show building is on the same level as the Mansion entrance, there's no walk-through portrait hallway (you ride past them), and WDW doesn't have the Hatbox Ghost. Small World is very similar except that it doesn't have the awesome facade, the boats aren't in a flume, and there aren't any of the Disney characters. Pirates will be nothing but a disappointment to you after becoming familiar with the original. It's much shorter, with no Blue Bayou, although the Carribbean fort facade and queue are kind of cool.
The benefits of the MK are that it's (much) larger, has some attractions that aren't at DL, and has some that are no longer at DL, like the Country Bears and Carousel of Progress.
Have a great time and be prepared to be underwhelmed by WDW's Pirates.