Call me crazy, but I miss DOS in general. Sure it was tedious typing in the exact commands, but it felt like you were truly interacting with the computer. Moreover, it helped teach accuracy and precision when typing; having to retype a lengthy command because you missed one key was enough of a hassle to make you pay closer attention next time.
Sadly I cannot play most of the games listed in the poll, as I tend to suffer from motion sickness when I play early FPS titles like Doom and Wolfenstein 3D. Mimicking 3D environments by manipulating 2D sprites just doesn't sit well with me.
I was more of a flight and space sim buff in the DOS era. I must have spent hundreds of hours playing classics like X-Wing, Tie Fighter, Red Baron, A-10 Tank Killer, and Chuck Yeager's Air Combat. Thanks to programs and services like DOSBox and Good Old Games, I still play many of these games today.