Yeah, originally Pat Birch certainly had a lot of waltzing in Night Music (not just during the opening but in some scene transitions, etc.) I think that counts.
Was South Pacific mentioned? Josh Logan purposefully didn't hire a choreographer and apparently largely let actors created their own dances for things like Was That Man because he wanted it to seem spontaneous and natural--the video of the 1950s London production shows this clearly (even Honey Bun is barely what I'd call choreographed, though I suppose the original point was about dancing and I suppose, as well, that it is dancing.)