They tend to take priority in the attention department, for obvious reasons, as well as be 'in the know' wrt what we need. At least, thats how it works for me. I have no qualms telling my INTJ 'Not now, dear.', whereas that is way harder to explain to others. He *knows* how my moods work, as he lives them, daily. He won't look at me bizarrely when I try to explain to him why this is important and how it is I cannot work around this. Or why I even dare to give this priority - the earful you get when you try and explain this to others...
Meanwhile, he has no problems identifying which circumstances will warrant a breach of my 'cocoon' without abusing the fact that he can actually enter as he'll be shooting himself in the foot if he does - there are quite severe consequences to not allowing me to recharge, especially for me and those living with me. My vivaciousness, warmth, understanding and empathy do eventually have a limit, if not allowed to recover. And considering he very much enjoys those spoils and knows first hand what happens when I run out, it is very much a priority to him to make sure I don't.
That is more than I can say for most of my friends or the outside world.
Iow, its a very different experience being our SO vs being our friend