Some people get bored because they can't find anything in their external environment to entertain them. Would any of you INFJ's say that your inner lives keep you from ever getting bored? Can you start using your inner life/imagination to entertain yourself with daydreams and new ideas at will? Or do you ever find that your inner life "shuts down," resulting in you getting bored?
I was actually going to type up a blog post about this. When I'm stimulated by my outside environment, the time I spend inside my head is very minimal. While I was in Egypt, poking around dusty temples and clambering over cliffsides as a very recent example, I was completely plugged into real time. And once that ball started rolling, even mundane and routine activities, such as brushing my teeth or laying out my clothes for the next morning while we were at the hotel, took on a very uncanny Se quality.
Yet, strangely enough, I felt more in tune with myself than I ever have been, even when left to my more intense meditative or imaginative states.
So yes, I would say that my inner life is definitely one of my defense lines against boredom. I need to be constantly stimulated externally with new activities or new environments. The one thing that's the downside to being a Ni dominant (at least in my experience) is constantly living in a state of "been there, done that." Because you unconsciously pick up on patterns so quickly, most of the time, you already have a distant idea of how things are going to turn out and nothing seems much of a surprise anymore. Or perhaps I'm romanticizing it.
In either case, I think that's a pretty interesting insight on your part, SF