I definitely need the DOS support.
One piece of hardware that I run at a radio station that I work at is an RDS encoder that lives on a PC card. The hardware is quite sensitive to hardware timing, and the custom software runs on either real DOS and a 286 / 386 *or* I've been able to make it work on a newer computer with OS/2's DVM by tweaking the various hardware and timing settings that IBM so nicely provided.
The same hardware won't run under Dosbox, Freedos, and the like. It doesn't work under Windows (and there has been no software update to it since the original DOS release)
The benefit of running it under OS/2's dosbox is that I can not only keep the thing running with newer hardware, but by tweaking various settings and using the SIO drivers I've been able to add in network capabilities to a system that was never designed to be network capable beyond a simple serial port and modem access. Between REXX, OS/2's Dosbox, SIO, and network stack I've got it doing things that it was never designed to do.
As for WinOS/2 support, I still use Pagemaker quite a bit.
So yes - I still find value in these aspects of OS/2.