Yes, that is my opinion.
I know there are other parks, theme parks (KBF) and Six Flags etc...
But none really capture the spirit of Disneyland. Especially the castle, Fantasy Land, where the smallest ones can really enjoy the fun, the connection between the films and the attractions. Then there is the parades, and shows. The characters, the character breakfasts, watching the toddlers play, laugh and interact. This is pure magic.
So Disneyland stands alone. And no one can compete. Not on this deep of levels.