Thanks, but I kind of wanted to know what my users would love, or I as admin. :)
As an admin it will likely be easier to upgrade if you upgrade often. Upgrading from 1.11 to 1.13 will likely be easier than upgrading from 1.11 to 1.20. Also, I believe the support cycle of the software is 1 year from release, so soon enough your version won't get security updates anymore.
That isn't saying that you should upgrade, just that you shouldn't just wait for some fancy new feature.
V/r,
Ryan Lane