Dont look down on people using the site facilities for loos and showers. Not everyone has a newish caravan with hot/cold running water. We have just upgraded to a caravan with a shower and cassette loo but have taken the decision that shower water splashing about in a 16year old caravan is not a good idea what with the condensation, possible leaks etc. The cassette loo however is brilliant after using a Portaloo for the last 10 years. We still try and use the site loos in the daytime to save having to empty it too often on a two week holiday.
We dont mind the walk to the shower block, gets a bit of fresh air in the lungs , its a good start to the day when the sun is just coming up. Just remember that people should be able to holiday in whatever fashion they like as long as it does not interfere with your enjoyment. If they want to sit in the caravan all day, well they are probably enjoying themselves as much as anyone else.