We don't drink/barhop but in general, we're a night family and in summer particularly, touring the parks in the evening makes more sense than trying to do it during the day. There are also many families from areas not in EST who appreciate the later hours.
If Disney would invest more into growing EPCOT and not simply destroy what's good there for the sake of the almighty dollar, EPCOT would be well used if they stayed open later and did not do partial shut downs starting at 9. That would pull a bit of the attendance down from MK, but not by much. What they need is for AK to complete its new attractions and start staying open late.