Started to use UNIX in the 1980's - before I stated to use MS-DOS!!! In the early 1990's I set up a SCO UNIX server with a few hundred terminals attached to it (MS-DOS machines with terminal emulation software).
Linux was the obvious next step.
Eventually set up a SLES (Suse Linux Enterprise Server) to replace Windows Servers. Administration dropped from mountain size down to mole hill size.
I have also used, and still use, Linux (Puppy and other live CD's) to recover problematic Windows PC's and solve Windows problems.
CD/DVD burning is still done using Linux and k3b.