First time I played wc3 I was very very young (about 8 and 9), but I remember being amazed by the many races present in the game: humans, elves, dwarves, orcs... a thought hit me: with the Editor, you can recreate Lord of the Rings! Everything about the game was enticing: the campaign, fighting a mysterious cult of undeath, traveling through harsh uncharted lands with the Horde to escape an ill fate, defending your homeland as the night elves, all the while exploring gorgeous new landscapes and meeting fantastic beasts like ogres, gnolls, murlocs, centaurs, furbolgs, and so much more! Though Wc3 (classic) graphics are dated, they sufficed to immerse you in this awesome story, and that immersion was a clear improvement over Age of Empires, which I also played at the time.
The Editor, of course, provided an equally amazing experience, where I recreated a scenario like Mount Hyjal, but with a quirk: everyone was under my control! The undead and demon forces, as well as the human, orc and night elf defenders. Then I had fun training attack waves and sending units to fight each other, occasionally using hero spells. Then I started learning triggers, and made maps I had previously terrained with automated barracks to train units and pit them against one another. My cousin explained it best to his friend: «he just likes creating maps where units beat the crap out of each other all day».

Truly, it was not just that. The learning process, and the honest love for this game, is what kept me allured. Sometimes, I worry I will never feel that sense of wonder ever again.
Then I went to BattleNet, joined wc3sear.ch, the Hive, unearthed treasures like
Wanderers of Sorceria, met all sorts of awesome people while playing, modding, and interacting here in the forums, helped others, debated interesting subjects, had huge laughters, and learned plenty. These experiences and these people, they opened up an amazing world for me, and definitely marked a portion of my life deeply. Thank you all, for everything.
P.S. — Oh, and if one day they write the history of computer games, I hope they give Warcraft III the spotlight it rightfully deserves for all the games and game genres that spawned from here, as well as the lives it touched and changed forever, as this thread demonstrates.