Oh right, I forgot about giant mushrooms. At least it has SOME use then, even if mushrooms are not really useful for much.
Shears.
I don't know exactly what the reason is, but shears only take durability damage when used on things they are meant to be used on. In other words, leaves and shearing sheep pretty much. That means you can use silk touch shears on glass and glowstone (since both break easily) and the shears will never take damage. Add Efficiency IV/V on them as well, and they'll be as fast as a pickaxe. Some may find this a bit cheaty though.
