I used it to escape. Make up elaborate fantasies and build on there. Often yes, it is sparked by something I'm curious about. But the ones I have when I'm stuck in a situation I have to be in without wanting to....they tend to be about anything, especially what I want to do still with my life and how to go about it and don't have to be sparked, at all.
That sounds like SiFi. You visualize/think about plans or fantasies and see how you feel about them. Being more Fi dominant your feelings tend to hold more weight. ISTJ would rely more on the plan instead of how he feels. Thats why a healthy ENFP is more flexible as long as the feelings are good. The plan is not as important. With ISTJ they rely more heavily on the plan and as long as the plan goes good they will know there feelings will match up.
Both though have the same type of daydreams.
With TiNi we logically process possibilities. Since ENFJs are more Ni they really more heavily on the possibilities. I rely heavily on logic to cut down the possibilities. We get lost in thought instead of daydreams. Pretty much everything I write on here gets processed through a huge amount of logic before I come up with what I write. Ti is my connection, my judgement between what I see(Se) and my internal theory(Ni) of why.
With an ENFJ I believe that society is what drives Ni and their theory of the world and not as much internal judgement. You need to use Ti to bring it down to an individual level. Instead of using your Ni with those around you, you have to open your eyes even when things dont go right so those things can get fed through Ti and processed and Ni can be rewritten in a personalized manner. While we are all alike and we all have the same functions, the same needs, the same wants, we have all have preferences. You can argue all day long "this is how people are, this is what a man wants, this is what they do, this is how they go about it, this action is used to cause this, all women are like this". While its logically true, it may not be important to that person or to you. Ni for you is whats "Normal" it seems like you judge things on whats "normal" and use Fe to make a judgement based on that. You can either find someone to match your theory, push your theory onto someone or learn how to change it.
You are already good at Ni, you just need to find the missing pieces.
Sorry if this sounds absolute, feel free to argue any point, this is based on what I see from an ENFJ and I would really appreciate knowing whats right and whats wrong so I can adjust what I understand.