Disney is very careful not to promise bed types. I noticed booking directly they only say "1 King Bed or 2 Queen Beds".... you can
not even select the actual bed layout, as you can with mostly all other major hotel chains.
Did you book through 3rd party /
travel agency? Was just curious how your confirmation said 2 Queens 100% guaranteed. I'm not defending Disney, as I agree with your point and others; you should never be forced to share a bed just because two random adults can fit in 1 king.
From Disneyland.com -
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Here's an example of how Hilton Anaheim lists their rooms, notice it's by bed type, not only "category/view" -
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