I also like the Embassy Ball Waltz in MY FAIR LADY.
Ditto on that one, DR JRand.
I recall that for a couple of summers the DJ at the Boatslip (in Provincetown) would begin Tea Dance each day with a medley of Strauss waltzes. Therefore, I have lost my sense of which is which. But I do like a Strauss waltzes, in general.
Do I hear a...

And, for another bitter, ironic Sondheim waltz (I had a good chuckle the day I realized that "A Little Priest" was a waltz): "Could I Leave You?"
Also, and I will defer to the musicologists who frequent the board, but isn't "Shall We Dance?" a polka, not a waltz? ("It's rather simple, the polka, really. It's just one, two three,
AND.") I know we all think of it as a waltz because it's so grand, but I believe it's a polka.