I don't know if they offer e ride nights in December but they are definitly worth the money. I just got back from WDW today and actually did two of the e ride nights offered during our stay. During the three hours on each night I probably rode each of the mountains 4 times plus haunted mansion (2 times), philharmagic, peter pan, winnie the pooh and buzz lightyear (2 times). That was with a couple short breaks. There were no lines on any rides, we just walked right on! I don't think this would be worth it during very slow seasons but when its busy it is well worth the $12.