1. Heat - My wife and I went in 2002 for our honeymoon and said we'd never come back during summer. Too crowded with too much heat. We're going back end of July but that's because we have our airfare paid for the whole family for a conference.
2. Cost - This should be #1. Disney has outpaced inflation for decades by a lot. And now we don't get free FP??? So, you pay all that and watch as others who are willing to spend an extra $100+ for their family each day stream past you. Big fat fail.
3. Money - I feel like the blue-state exodus to the red states is causing a huge economic disaster for those who live there as their home prices skyrocket but wages don't and can't. The 20- and 30-somethings that typically fill WDW and DL are now spending way more on housing that they ever have before. Living in California, let me apologize for that. I wish they would've stayed as much as you!
4. Universal - With just their two parks and water park, the last two times I came to Orlando I preferred to spend time there. It's what Disney used to be 15 years ago. And now with a new park, why spend so much more for Disney?
5. Disney - They just can't seem to stay out of their own way. Lots of refurbs that have happened. Parades that should've stated months ago won't start til the end of summer. Taking out Muppets, RoA, no Big Thunder, etc. And then their battle with the governor made a lot of folks sick on the brand.
Add it all up and you've got a relative loss. They're still making oodles of cash. They just don't need Scrooge's money bin this year.