I would still highly, highly suggest going!!! It is so cool to see MK all decorated and the overall atmosphere is awesome. Plus the rides are all open with little to no wait. The fireworks show is great and it is easy to find a spot compared to the normal showing. Lastly (I almost forgot!) is the great parade. Watch for the headless horseman! So I would say yeah, defintley go.
We (myself-26 and fiance-31) went twice in 2001 and are going twice this Octobr for our honeymoon!!!!! It was worth every penny and just as much fun without children. I agree...the Headless Horseman was so neat. There was so much to do, and it was nice to be able to ride attractions until midnight.