[adrianmacneil]

Another (even more simple than Money) example are many of the standard library classes.

For example BigDecimal. With operator overloading, I can easily compare a BigDecimal object to an integer or float, the same way I can already compare them to each other:

    BigDecimal.new("10.0") == 10.0
    10 == 10.0

Without operator overloading, this would become needlessly messy (and require explicit handling of nils):

    d = BigDecimal.new("10.0")
    !d.nil? && d.value_equal_to(10.0)

Ruby has always been about readability of the code, and avoiding unnecessary repetition, and I think operator overloading (when used correctly) is a great example of this.