total time and a place type thing. in 1993 adults weren't used to games that both looked incredibly visually immersive and let players take their time with exploring the world and solving puzzles. and the story is pretty unique for a game at the time, FMVs looked good in 1993.

imagine all the adults who used computers for work but weren't nerdy enough to get into zork and also weren't interested in being constantly punished by kings quest 6. it was easy to get immersed in an environment like that, first person, slow and methodical, and better looking than anything they'd ever seen on a computer monitor at that time. then add that it's the first computer game to get that general hype.

its boring to me too, i am more interested in kings quest for adventure games, or doom which came out the same year too, but it was a phenomenal looking thing that drew an incredible amount of people who had only thought of games as a vaguely remembered Atari 2600 or pacman cabinet from youth.