I can't really speak to Starlight as I have not been in the MK since it debuted. For extra evening hours, I think the one to keep/not miss, would be the MK. We did not find the Epcot extra hours to be very useful because there is so much that is closed, it didn't really help. Regular guests are able to get in line up until park close, so for the more popular rides, there were still long lines at closing (especially for Remy, Frozen, and Guardians), so the wait was still about 45 minutes. If you don't mind missing Harmonious and getting in line then, you might do better. The second hour was an improvement, but because the first hour was basically waiting for one attraction, we were able to do 2 more attractions in the second hour. There is a lot more open at the MK, so it seemed a better use of the 2 hours. AK is probably the one I'd skip. So much is closed there now too, I think if you went either for EMH in the morning or late afternoon on a non evening EMH day, you weld probably get as much done. Enjoy Starlight (and consensus is the second parade is less crowded), I'm looking forward to seeing it in a few weeks!