Yes, watched it in English class, in a sort of double-feature with Antz.
"Compare and contrast the...in Gattaca and in Antz"
I remember being shocked by how utterly cool this movie was, and that we were watching it in English class! It's a great movie, full of awesome imagery as well as being both inspirational and philosophical.
Re: ATHF in American Lit, my ex-pat Scottish physics teacher in high school made us watch The Englishman Who Went Up a Hill But Came Down a Mountain, for what reason I don't know, but it was brilliant none the less! This was in addition to episodes of Are You Being Served and Keeping Up Appearances.
High school was quite awesome, but it all balanced out when I landed up in university ;)