This has nothing to do with "Generate Structures". Structures seem to generate very rarely after the update. I've found only 1 village, 1 desert temple, 1 mineshaft, 1 stronghold, and 1 monument. That may sound fine, but that's the total of several worlds after the update.
Also when creating new worlds select the classic world size. Villages seem more likely to spawn on classic. Once a world has been created and you have confirmed there are villages you can extend the world to Large.