Hmm, I am on the complete opposite from you, I can relate to INFPs, though there is always that intensity of feeling I will never truly get, though Fi is high for me, Ti and Ne far surpass it, there is always that 'but that isn't logical, Why the hell am I feeling that' quality that is always present. Perhaps you just haven't found the right INFPs that you can relate to, they are an odd bunch, like INTPs, you find some that will like the Ti/Ne similarity with Fi/Ne, and others who just aren't your cup of tea [or you aren't their cup of tea].
For ENFPs, idk i haven't had that intrigue by them, I mean they are there, very active, but most [I assume immature 7's] are very fleeting, I can have a conversation with them, but it's more-or-less witty banter, and followed by them leaving the momentary niche we have formed and they go off elsewhere. Oddly enough I haven't met an ENFP 4's, but I haven't met many fours to begin with, and the few, only two that I know of [my gf and my best friend] are both 4w3 INFPs, I've toyed with the notion that ENFP's and type 4 isn't really compatible, all the ENFPs that i've known have been 7w6's hmm interesting phenomena indeed. lol Hopefully the success stories come along and that we as INTPs aren't totally doomed in the world of NFPs , though I have a feeling i'll have to create my own success story and learn from everyone's experiences.