Why people like it so much is because the content feels more immersive. Instead of looking at a shark on Discovery Channel, there are apps that put you in a shark cage and allow you to experience what it’d be like to see the animals swimming around you.
VR is similar in that it sometimes uses tricks to add realism to content, but it doesn’t stop where the screen stops – it fills your entire field of view with an image or environment. When most folks think about VR, their first thoughts are of 3D – the display technology that used stereoscopy to give the illusion that images were popping out of the screen.