To connect to the OP, INTJs don't seem too thinky to be intuitive. Their intuitive process is linked towards quantifiable data, rather than focused on the interpersonal level. It still connects with an overall concept map/ web of thoughts that links to a centralized idea. It takes the external data observed and proves a hypothesis that Ni gets a hunch over.
I find INTJ style intuition in conjunction with Te to be helpful when I end up focusing on internal logical references and make conclusions based on data that isn't there. Ni-Te takes the general concept and searches for data to actually show proof that what is happening is true. NTJs in general seem to lasso in my own Ni-Ti thought process and searches for better terms to explain my own thoughts, and I have to present evidence to prove it. They do have an assured confidence that their intuitions are right, and often times, they are. It's like they come up with a rationale/theory in a burst of insight, and can come up with the data to back it up. It doesn't lack intuition in the least bit in my perspective. It's just more of a focus on "things".
I actually like the INTJ intuitive process, it seems less clouded by Fe based judgments to me. Often times, I feel that my intuitions and conclusions can be obscured by Fe-based people understanding, which is great with understanding others, but it's really not good when you're analyzing a system (and want the best outcome for everyone involved). INTJs can come up with a solution that focuses on solving the problem. It counterbalances my Ni-Fe process. It allows me to refocus more on an Ni-Ti perspective, being more objective. Sometimes my Fe can get the best of me, and Ni-Te rakes through the b.s.
In sum, INTJs don't seem too "thinky" to me to be intuitive. It's a different way of making a judgment based off of Ni-insights.