2much2do - Thanks for the info, I just called Disney and got the park hours for the time I will be there in early May. The CM on the phone seemed surprised that neither the phone system nor the web site had the hours posted.
As for the old days (like the 70's) when MK was open later, one thing I remember was that after the rides closed, the shops, particularly on Main Street, stayed open and they seemed to do unbelievable business as the park was emptying out. We would often wait until closing and then stop at the candy shop or bakery and get something sweet to eat. Then buy a shirt or toy at the Emporium, get a balloon (or popcorn) and then catch the resort monorail. Now it seems when the park closes the shops do too.