I love this article on TechRadar about how Apple has established its philosophy for creating superior user interface.
The article says that when creating a user interface, instead of resorting to user surveys (ugh groupthink), the Apple team would decide the issue internally, always going for the options that would result in the most pleasure or fun for the user. It was this method that allowed the user interface to take on a sense of personality.
That’s not to say that other UI scenarios don’t have personality, they do. They’re just usually boring and not much fun.