We enjoy going to disney without the kids. One of the main reasons is that we can get there quickly from our home. But really, WDW can be great for adults. We love the deluxe hotels, AKL, SWAN, GF, even the POLY. We can do Pleasure Island, VIctoria and Alberts, the California Grill, etc. We also enjoy walking along the boardwalk and really exploring Epcot.
We tell our kids where we are going, specifically we tell our 6 year old little girl that we will bring her back a surprise from the princesses. They have always accepted these mini trips without a problem.