From what I've read, ENFJ's are the most introverted of E's and INFJ's are the most extroverted of I's. As an INFJ, I often wonder if I would have been an ENFJ if I had been raised in a different environment.
I'm an INFJ and have several friends who are INFJ and ENFJ. The big difference I've noticed is that the INFJ's tend to really focus on a couple of key people that they are devoted to and develop friendships with. The ENFJ's tend to make a new friend everywhere they go. Otherwise, we are all very simpatico in our beliefs and leanings.
Also, the INFJ's seem to do most of the work as far as initiating contact, whereas the ENFJ's just seem to respond to whoever is in front of them at the moment. I have also noticed that the ENFJ's are more charasmatic. They have more "followers." I wish I were more charismatic, but then maybe it would be annoying having people "following" me.
Finding other INFJ/ENFJ friends has been a great blessing in my life. It's so nice to finally have people who think the same way.
That all makes sense, especially the new friends everywhere thing.
Honestly...I get the impression it could be rough being ENFJ. I find it kind of rough being INFJ, I know it's been a bit of a rough year but honestly...it's feeling things really hard and taking hurt really painfully, feeling misunderstood, all that emo stuff

I almost get the impression that ENFJs are very similar, but they feel things even more intensely, and in a similar prolonged/obsessive way to INFJs! And maybe people understand their need for alone time less because they're extroverts.
However, I'm considering the possibility that ENFJs feel things at a very similar level to INFJs but they just EXPRESS THEMSELVES more intensely.

Sometimes when I read posts by someone like Domino, I really really relate, but it's like a super-intensity of expression, very dramatic. Not insincere, at all. Just dramatic. I think it's sort of the way I would like to express myself, but I would feel too exposed and like I was over-dramatizing.
I have one good friend who is almost certainly ENFJ, and...yeah. She feels things super-hard and expresses herself so intensely about them. I'll be really feeling for her, but also kind of thinking "whoa, don't say too much! Don't overstate it! Don't overexpose yourself!"
It's good though, because it makes me feel less alone, I think. Even with other INFJs, sometimes you know they totally understand your pain and why you feel that way but as far as expressing it with each other, there's usually a certain reserve, even if you're very close to each other. In a weird way, it's nice to interact with others who don't feel too reserved or shy, or less so, about discussing bone-crushing emotional agony and all the rest.

At least, if I'm reading that right.