The sad truth is that many communal bathrooms have fewer sinks than toilets. That means that users should at least be vaguely aware that there are probably other folks trying to get to the basin and wash their hands. Except, that is, the ones who don't wash their hands or just simply run water over them in the blink of an eye. We know who you are, and we do not approve of your methods.
It's OK – I guess – if you want to hit the restroom after lunch to brush your teeth and floss, fix your hair or reapply makeup. Just don't hog up the space so others can't wash their hands or get to the paper towel dispenser. Move over if you have to. Remember, in communal bathroom settings, we're all in this together.