What resources will be impossible to acquire when structures are disabled?

I'm considering starting a map with the structures option disabled since I don't really like the villages and the abandoned mine shafts. The mine shafts especially, seems to take over all underground areas to a point where it is hard to find any natural cave systems.

I also realized that ravines, which I like a lot, will still be generated when structures are disabled.

The one resource I know I will miss are melons but giving 1 melon seed as server admin should fix that.

So what other resources of importance will be impossible to find when structures are disabled?

Abandoned mine shafts

• As you said, Melon Seeds will be unavailable.

Strongholds

• The cracked and mossy variants of Stone Bricks will be unavailable as a building material; normal Stone Bricks can be crafted.
• Ender portal frames will be unavailable, and with it the "The End" dimension
• Red Apple

Nether ruins

• Nether Brick
• Nether Brick Fence
• Nether Brick Stairs
• Nether Wart
• Blaze Rod (as Blazes only spawn around the ruins), and all the derivatives.