The Nintendo 64 broke some major ground for gaming innovation in multiple ways, and is actually featured multiple times in this list. While not the first console to have 3D environments, it was the first to have a player controlled camera.
Super Mario 64 was mind-blowing when it released in June 1996. The concept of a player-controlled camera was something nobody had ever thought of in a home console. To soften such a crazy idea of controlling Mario AND the camera, the developers actually made the camera it's own character: Lukitu. He was filming Mario's adventure and you could even see him when you looked in mirrors. While the camera controls are second nature today, Super Mario 64 and its success is mostly to thank for its adaption.