I can tell you that my own kid, and his friends, and our rather large family, ALL wanted to go to HS this year for the new Star Wars stuff.
Don't underestimate the draw of a Jawa, and Stormtroopers, Kylo Ren, Chewy, Star Wars night time show etc..
Maybe you don't personally care about it, but there are a lot of little boys, and girls, and adults, who are extremely excited for it. In a World of Princesses and Disney Junior characters.. I for one am happy about this addition.
We have a rope drop to close day at HS planned, and we still won't be able to fit everything in. I think Fantasmic is the best show (besides celebrate the magic/wishes) at WDW, I am choosing to skip it this time so we can do the Jingle Bell, Jingle Bam Dessert Party..I've tried to figure out if we can make it back for 1 evening. We can't, and that's ok, but it means that we won't be able to "do it all", even with a full day.