The traditional Avengers have been friends for the most part--we know that Moondragon isn't cosy with anyone on the team, that Crystal, Pietro, Sersi, and Dane had their problems, Mantis was largely self-serving back in the day, and there has been heavy tension between T'Challa and IM--but basically these are people who known one another fairly well and care about one another.

If they run into one another on the street, they're happy to see one another. And if one of them walks into the mansion/tower, the others say hello. There were plenty of times 'in the old days' when we saw them sitting around, having tea together and chatting.

Let's not forget that for many of the 'early' Avengers, their realtionships are of many years' duration, and that includes [dead or alive] Cap, IM, Thor, Hank, Jan, Hawkeye, the Vision, the Scarlet Witch, Pietro, T'Challa, Wonder Man, Natasha, Hercules, and others, including Carol and She Hulk, who came a bit later.

Now, they've not all had smooth relations during the periods in which they've known one another, especially Pietro, and we know that Carol felt betrayed when she went wherever she went with whoever that guy was, but for most it's been fairly smooth sailing.