If I'm in a group, I'm usually wishing I could go hang out with just one of those people (sx). I'm wishing I could hang out with just that one person - just the 2 of us. It's more intimate, it's more intense, it's easier to focus in on them and really get to know them for who they are, etc. Even guy friends, I'd rather hang out with my ISTJ buddy and catch up with what has been going on in his life over the last few months - maybe over a football game - than to see him in a group. If I see him in a group, I can't really talk to him and find out what's been going on.
I can hang out in a group and be laid back and just go with the flow and then go home. But, it's just not the same. It feels kind of "empty" or "pointless" when I go home at the end of the night. Sounds cheesy, but I'd rather take a walk with someone or just do something fun with 1 person, or just "talk" than to go to dinner with 5 people. It gets too chaotic, too much going on, too many different conversations going on. If it's just me and another person, we have each other's undivided attention and we can really have an interesting time - whether that be laughing our butts off, talking about things we wouldn't share with a bigger group, or whatever. I can do either one, but I have a preference for the 1-on-1.
Another example to illustrate is my grandfather was single for years. We did a lot of things together - we were very close and I enjoyed hanging out with him. Then he married and it was never really the same again. I mean, I'm OK with it - I'm glad he found someone - he's much happier in life. But, if I'm talking to him about something that I want "his input" on, I always have to get 2 answers from 2 people now. I sometimes just want his opinion and nothing else. Or, just to hang out with him.
During holidays, I like to spend time with individual family members that I haven't seen in a while. 1-on-1 with each of them for at least 5 minutes to see what's been happening. To me, that's much more meaningful and fulfilling than 13 people having 7 different conversations about 5 different topics. That makes it feel "fragmented" - I can't really find out about "you" and how "you are doing" if I'm listening to 13 different people.