I find myself in a lot of these replies.
I've done WDW and DLR back to back for my fall trip this year. 2 WDW trips and have been coming over from Germany to Disneyland for over 10 years now.
It's unlikely you are going to hate WDW. Yes, it's different. Some aspects I could definitely do without. The distances are enormous. The drunk people at Epcot. The Avatar stampede. The fact that you rarely found any roaming characters. But that's not enough reason to hate the whole place.
Other things I loved. The variety of restaurants. The amount of character meets. You can actually get FP+ for some character meets. The Magic Bands - I was actually trying to scan my watch for entry for almost a week after I left Florida.
They have more room in Florida, so they can add more things. But that ends up in certain "variations." I think it was in the WDW Restaurant section here were I saw a topic "how many Italian Restaurants does WDW need." Bigger doesn't always mean better, and things get repetetive.
WDW was fun. I will go back when I can, but I am in no rush. After a week there this trip I texted one of my West Coast friends: "I am ready to come home."
Disneyland is home for me. Not WDW, not Disneyland Paris. I smile when I even see the first billboard coming from the airport. I love it that there's almost without exception a character meeting on Town Square when I walk in. I love it that on occasion a character or a Cast Member will remember me. And the new Maxpass is a really cool feature in my eyes, better than FP+. But I don't think it would be doable in WDW - too large and too much pressure on the Wifi.
Years ago during the D23 Expo a friend of mine was in a store with her son and wanted to buy a pin for me. There was a series of Mickey with the parks' different castles. She had grabbed the Paris one. He saw, asked her why she had got that one and she told him because Paris "was my home park" He shook his head "no", took the pin from her hand and said: "She wouldn't be caught dead calling Paris her home park. She needs this one." And he grabbed the Disneyland pin. How right he was...