I call it ‘Star Wars’ too, partly because that was the original name and partly because I think the film is the essence of Star Wars; it encapsulates the feeling of the Star Wars universe to an extent, and at the end of the day, everything else is derivative. But as mentioned above, if you say your favourite movie is Star Wars, people are going to ask which one.
Calling the film ‘Star Wars’ is relegated pretty much to OT purists like us lot on originaltrilogy.com. Let’s treat the official name as Star Wars, but in conversation, refer to it as ANH for handiness.