Europa Park: It's a stunning park, no doubt about it, and they do so many things right. But I just think some people over hype it. The hardware isn't bad, but it isn't 'great' either. Lots of 'average' versions of different ride types, none of them close to being 'top of class.' It does have a good variety though, that much is true. I also didn't have a great customer service experience either, being telephoned the day after checking out, and asked if I'd been smoking in the room (none of us smoke) as they'd found cigarette ends in there!!! They were actually very rude.
Efteling: I don't get it at all, I really don't. Best coaster there is the viking one, and that's purely because it's themed incredibly well. Baron isn't great, and on my showings, seems to be the least reliable B&M on the planet. Woodie is meh... Honestly wasn't impressed. Again it is pretty, I can see that, definitely the sort of place I'd take Cara... But for me, meh, no thanks.
Disney Parks: Never been to one, don't intend to rush to one any time soon... Don't think I need to to know they're not really my kind of place. See above.
Just a reminder, I'm a hardware kind of guy. I'd take a collection of outstanding coasters built on a car park any day, over average coasters that are well themed. Which definitely explains my answers.