Expect early closings.
We went Jan 2002. MK closed at 6, perhaps at 8 on Saturday--can't really remember that.
Epcot was 10-9, with FW closing at 7. A few things at FW were open till 9--the biggies
Spaceship Earth
Test Track
Honey I Shrunk...
Studios were open until about 7.
Cannot remember fireworks, Fantasmic, etc schedules. Epcot ran Illuminations every night.
It worked out well for us, on those early closing nights, to make PS for a late dinner--7 or 8-ish. It helps stretch out the day and makes the magic last until bedtime.