My two always, always run to the door to see who's here. Snowball doesn't care if you like cats or not, you WILL pay attention to him. If you ignore him, he WILL get in your face or on your lap, whatever it takes. We also do our part if we know a visitor doesn't like cats and make sure he doesn't bother them too much.
Simone on the other hand, it depends who's here. Like one Christmas we had 14 people here. She stayed in the bedroom. Whenever a family member comes over, she's out and about. Kids, she will stay in the bedroom. If it becomes very quiet, she'll venture out, but once she realizes the kid is still moving around (not asleep), she high-tails it back to the bedroom.