For me it's just a nice change of pace. In most modern shooters the main strategy is to hide behind cover, creep around corners, and try your best to be on the outer edges of the battle as you work your way forward.
With Doom you are basically a sledgehammer driving your way through every encounter of that game. Getting in the face of every enemy and ripping them apart as you dance around their fire. Mix that with the speed and swiftness of the controls as well as the different combinations of enemies they throw at you, it became a very enjoyable experience for me. I almost wish there was a mode that you could just turn on the speed boost indefinitely because I just wanted to go faster. That might of been too much, though.