Here's an Ni-ish suggestion to keep you occupied: Consider that it's not the theory that has a problem, but the way you're looking at it. (Of course, changing your perspective on this isn't "using Ni"--Ni is just an attitude that would you encourage you to be aware of numerous conceptual interpretations.)
Cognitive function theory is not interested in what
people do; it's interested in why
they do it. Functions represent cognitive tendencies that lead people to adopt certain types of values by interpreting and organizing information from different perspectives. "Using" a function means interpreting the world and your relationship to it from the perspective of the associated attitude.
I want to know where you came up with the idea that "using a function" means "performing x action." It's just not that simple. Of course you find patterns, change perspectives, remember things, notices things around you, have personal values, build some mental frameworks, get things organized, and blend in with your culture--duh. None of those things represent "using" any functions...your functional makeup is determined by why
you did them, what perspectives
led you to perceive and judge the way you do.