pandy and bonnie both wait outside the bathroom and toilet and even come in ( i leave the door open) and just sit around until i get out, they follow me a lot through the house, i don't know why they do it though
Mine also protest at being locked out, so I let them follow me in, and if needed, I tell them "Privacy!!" and they leave without too much fuss. Their big thing is the entertainment of watching a toilet flush!
Oh, yes! My 15lb Hobbes can be felt & heard bounding from across the apartment when he hears that bathroom door open, and proceeds to then lay down in the doorway, as if to say, "Ha! Now you can't ever CLOSE it again!!" LOL...my goofballs! I think they view my being there as if they've got me stuck there, and I have no choice but to pet them.
Both of my boys come running when I go in the bathroom. Since I live alone, I don't bother closing the door anymore. Frantic jumps up on the sink and gives me headbutts. Pipsqueek is what I call a social pee-er. If I'm peeing, he has to pee. So he hops in the litter box whenever I'm in the bathroom.
If they are awake they keep us company in the bathroom. Should we dare close the door completly they would scratch it untill it opens. But since they have their waterbowl there I guess it's only natural that they want to be there