MNSSHP is (was) my favorite of all Disney events. We went every year from 2012 until this year, but didn't go this year, due to the ever increasing crowds and 2018 experience. That being said, if you have never been, you have to go. Just make the best of it, even if crowded. And if you don't go, you still get to see the decorations, which are awesome. (we still did Disney, just not a party).
Love love love the parks at HW and Christmas.