En suite is nice, but so many of us started life in homes with outside - sometimes shared - dry lavs. At school we had 'two holers' ie a long wooden seat with two holes in so you could sit with your friend.
Therefore it is enough for me to have an indoor lav!! When we moved from the house with outside shared loo, when I was 5, to a council house with TWO loos - one just outside the back door and one upstairs, we thought we were living in the ultimate luxury. My current house is a bungalow, with a loo separate from the bathroom and easy to get to from the whole house. Oh, just remembered summat funny: we had a cat that invented toilet tennis. I was sitting there in comfort when the cat shoved biro top under the door. I kicked it back. He kicked it back to me and so on.
I know this thread was about hotel etc loos though, and I have to admit, at this age I need my privacy. For a start off, I like to sleep naked, so having to put on a nightie to go to a communal loo would be a pain!
Oh, if you need your privacy, never go to sea in a sub. On the 'A' boat where my husband served for a while, the lav was in an inadequately curtained alcove directly opposite the galley. The sailor could sit there and chat amiably with the chef. I suppose modern subs are posher in the lav department though.