I've never been to WDW. I've spent a lot of time contemplating a trip there (we are CA natives and have been going to DL our entire lives), but every time I look at photos of the parks, etc., it feels SO plain compared to DL. The entrances to many rides look, to me, like plain buildings on the outside. That's part of what I love so much about DL is that there's been so much attention to detail that stepping into FL for instance, feels like stepping into a storybook land. The facades of the rides are so detailed, and make you feel like you're really entering a special place. When I look at photos of WDW ride entrances, I just don't see that. It's what turns me back to DL every time.
Additionally, when researching possible WDW vacations, I get turned off very quickly at the idea of having to stand in line for a bus with my 4 kids, load said kids onto the bus, then ride the bus with dozens of other sweaty, smelly guests (i mean, considering the weather, we'd all pretty much be sweaty and smelly, right?) just to hop from park to park! Sounds like a huge hassle!
Also, I don't love the idea of having to visit 4 separate parks just to get to the rides we are used to being able to easily get to in just 2 parks.
Lastly, I hate humidity and standing or walking in the rain. So, for most of the year anyway, that pretty much rules out WDW. On the other hand, you can pretty much count on the weather at DLR to be fantastic for most of the year.
I may be totally incorrect, and not having ever been there I can't be sure. But honestly, WDW sounds like more work and discomfort than fun.
DLR is personal, it's easy to navigate, and to me it really feels like it's own little world as opposed to a theme park.
Hope you have a fantastic time!