I find that sometimes several of my templates have exactly the same section (like a standards set of "Create from Template" macros). 

Whenever I decide to update that common area in one template, I need to go to other templates and update it there as well.  

I wish that in a similar fashion to how I can include one existing Confluence page within another page using the Include Page macro, I could include one template within another.  This would allow for consistency, as well as make it much easier to maintain multiple templates that share some common functionality, by being able to update it once rather than going into each and every template and making the same change.