2004 wan't that long ago.
Chronologically, a decade is a relatively brief moment in the universal sense of time. Technologically, 2004 was light years ago.
2004 saw Kanye drop "College Dropout" and George W. Bush begin a second term. It's also the year that ten of the most influential games were released to the public. Games that changed, ahem, the game. Online connectivity for console owners, massive game worlds that hadn't been previously possible, and titles that would shape the gaming landscape for years.
Grand Theft Auto: San Andreas, Halo 2, Half-Life 2, and World of Warcraft all debuted a decade ago and have successfully made us feel old.