I did not grow up with a console. Pretty much just floppies with TLC games on them. My grandma introduced me to Sierra and Blizzard games, and they were exciting yeah but not mind blowing.
But then warcraft III (didn't play Starcraft much at this time, was young) introduced the concept of custom maps to me. Basically going from having one game to dozens. Tower Defenses, RPGs, genres that basically either didn't exist yet or don't exist anymore (rip Enfos...and RP maps seriously wth)
It pretty much shaped my childhood, friends, and all that stuff. Really sad that SCII never really became what Warcraft III was to me.