This is exactly what happens at my house when it's bathroom time. That includes showers, tooth brushing, hand washing, or looking for a Band Aid. The only time you won't find both of us in the bathroom is when I'm drying my hair. That's because the hair dryer sounds too much like the evil vacuum. If you go in the bathroom and close the door, Cassie will either meow or sit there and wait till you come out. Leaving her outside a closed bathroom door is not okay as far as she's concerned.
Helen, this is a great topic!