What does "as" do here?
"As" acts as a comparison in this sentence. Ellen is telling her audience that she is really excited for the "Finding Dory" movie. When she said "as," she is telling her audience that her excitement would be exactly the same back in 2003 as it is now; that the amount of her excitement would not change. Here are a few example sentences with "as" being used as a comparison. Ex: She was as excited as her sister. Ex: They were as excited as children at a candy store. Ex: The kid was as mean as a crocodile.