It can depend, some years it is a bit later then normal. MK useally closes much earlier then I would like, 7:00 some nights, 8:00 some and a few (saturday) as late at 10:00.
Epcot everynight until 9:00. (normally the latest park open.)
MGM 7:00 (and Fantasmic starts then) Animal 5:00 or 6:00.
It irks me that they charge peak rates at this time for Spring breakers, but the parks (MK mostly) still close so early. The one night it is open late getting home is a real pain in the but.
Let's hope for later hours or some of this extra hours in the evening for resort guest (we are going the 1st week of March 2005.)
Water parks close around 4:00 or 5:00. It does get dark earlier so things do close a bit earlier, but I love MK after dark.
DTD and PI are always open late and fill up. Now that we have a small child we just go back to the resort and rest up for the next day.