I'm a 3w4. I find the 4 comes into play in my desire for uniqueness...my strong distaste for blending in to the crowd, conforming, or fitting in. I really like to stand out although, paradoxically, I'm an introvert who hates being the center of attention.
There are 3w2's on here who could explain when the 2 comes into play for them. I'd probably get it wrong if I tried.