Just back from Jan 4-9 at WDW.
Since the other parks closed early, we went to Epcot in the evenings three times. Saw Illuminations on night, and on other nights, went on the rides when everyone else was looking for a spot to see the fireworks.
If you're going value season like us, then we found there was pretty much no line at all if you go late. We went around 8:30 pm, and got on very quickly. Best times for MS and TT would be first thing in the morning, or near closing.