I feel like a lot of these people haven't ever even played the original version of DOOM from 1993. It's not some 200mph constant barrage of killing demons while pulling off sick rocket jumps left and right, it was a hell of a lot more slower and clunkier to play than these people remember. It was still very close to how Wolfenstein 3D played in that it was "3D", but there was no looking up or down, and there wasn't any mouselook.
Actually, now that I really think about it, it feels like a lot of these types of people give credit to DOOM, when in reality it was Unreal, Quake, and Half-Life that had the fast pace slaughterhouse gameplay by design.