^ It is canon. Movies are canon, inferior to books only in instances where the same scene is played out differently (e.g. Snape’s death in the Shrieking Shack or the boathouse)
I found it rather creepy, but I can understand how people may classify it as emotional. I think this was one of the worst additions in the movies because the entire scene is placed in context which makes it seem that Snape never got over Lily's rejection of him and placing the scene right after his Patronus and Dumbledore's "After all this time?" makes the entire context based around a drive that is solely motivated around unrequited love. There's nothing more after it, the "Always" line is now completely distorted by the movies and it's the last note Snape leaves the cinematic scene on. Movie Snape will never equate to the complexity of Book Snape, and one of the most insulting things for a person to say that people like Snape only because of Alan's portrayal.