What's the point in defaulting functions in C++11?

Question

C++11 adds the ability for telling the compiler to create a default implementation of any of the special member functions. While I can see the value of deleting a function,

Answer 1

For me its the disabling feature that will be useful, For most of the classes I currently create I disable copying & assignment - it will be nice to have a feature the compiler can recognise to do this, rather than depending on linker errors.