I mean, it is a theme park - hard not to expect cartoony architectural interpretations even if the park was once known for being realistic.For reference: Dinkelsbühl:
... and Rothenburg:
I will note, though, that when you google them you get a lot of photos that have had the color saturation artificially boosted, like the one below. Maybe that was the inspiration.
I'd argue that Killarney looks like a box of Lucky Charms.