I'm not really at a point with INTJ's where I feel like I can "get in their head" - I find that nearly impossible to do. But when I'm interacting with them, I try to keep Ne somewhat on a leash (is this wrong, from the INTJ perspective? would you rather me let it run rampant?) because I know they like structure, they like things somewhat neat and tidy, and also exactly because of what you mentioned about "walking, walking, skipping, tumbling". As the INTP in the conversation, I can sense when the "tumbling" begins to happen - and I sense that it's not always appreciated. So, I just try to stay somewhat structured. It's almost like I'm trying to be an INTJ myself so that we'll be speaking a similar language. I recently met with a host of NTJ's - like 15 of them - scientists. I was able to explain myself, talk about my perspective, etc., but it felt like I couldn't be "funny" - like I had to be ultra-serious. Then, suddenly, I met with another man in his office and he said, "I just want you to know that I'm the sloppy, absent-minded scientist of the group. I'm not like the rest. Let me show you some of the things I'm researching." Instantly, I recognized Ne!! It was like I could finally take a deep breath and relax. Tell a joke, be funny, let my guard down, be non-politically-correct, burp out loud if I wanted to (I wouldn't, but it's good to know that you could if you wanted), talk about something other than the task at hand, etc. I thought he was INTP at first, but he turned out to be ENTP.
I'm not saying this to bash NTJ's. I really enjoy my NTJ friends and acquaintances. I'm just offering perspective from the INTP side. I know that I could probably give Ne more free reign if I wanted to when interacting with NTJ's, but I sometimes don't know how, if, or when it would be appropriate. It feels like there is an unwritten rule floating around that you have to be serious all the time. I know this isn't true because I have NTJ friends who I play basketball with or hang out and joke with, but in a professional setting it always seems so ultra-serious and I can't quite get in their heads. One good thing is that I know I can give Ti a voice and they'll appreciate that. I can speak bluntly and put my knowledge out there and that usually goes over pretty well. Ne, on the other hand, you just never know if it's going to work or not.