Our team was just discussing this. In our case we would specifically like to copy a program and all of it's projects, or to be able to make a template that achieves the same outcome.
I came to enter this same idea - we want this! I know we can use templates but we want to be able to copy groups of projects (for events to use for the following year, for example) - with so many projects in a program we really want to copy in bulk OR have the ability to copy a Program (and all its projects). There is a separate ticket for ability to copy programs, I voted on that as well.