The guy tossing luggage is a factor for me as well
Well, it's nice to know that people like it (it's also a good hint for us to pay special care for that animation), but there are many other important features in GSX, the most difficult one was the Pushback, because we fought hard to fix the "skating" effect that is usually associated to that...
Note that, having believable animated characters is a benefit of being FSX-only, because there's no way FS9 could support that kind of animation.