All of the "Elvish" in the movies was Sindarin. PJ had a pretty good reason to make it that way. By the time of the Third Age, Quenya was rarely, if ever, spoken as a true language. It had become a language of lore, and mainly the language of the remnants of the House of Finwë (even they used Sindarin most of the time).
It all began in the First Age, after the Noldor came into Beleriand. Back then, Elu Thingol was High King of the Sindar. When he found out about the Kinslaying at Alqualondë (where his brother's butt was kicked incidentally), he immediately banned everyone in his kingdom from speaking Quenya, "the tongue of the betrayers," and so, the Noldor began to use Sindarin as their common tongue. Quenya stopped being the vernacular, and Sindarin became more popular.
I imagine, however, that the line of Fëanor, most of which didn't like Thingol much, kept Quenya "alive," along with Galadriel and Turgon, and others of the Noldor, but for the most part, it vanished.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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