While most organizations no longer need a DMZ to protect themselves from the outside world, the concept of separating valuable digital goodies from the rest of your network is still a potent security strategy. If you apply the DMZ mechanism on an entirely internal basis, then there are still use cases that makes sense.

Should I enable DMZ for gaming?

DMZ can be used as an alternative for port forwarding all ports. Enabling DMZ server eases the traffic for gaming devices (XBOX, PlayStation, Wii), DVR (TiVo, Moxi) & devices connecting to the Virtual private network.

Is DMZ dead?

In computer security, a demilitarized zone (DMZ) or perimeter network is a network area (a subnetwork) that sits between an internal network and an external network. ... For someone on the external network who wants to illegally connect to the internal network, the DMZ is a dead end.