Oh god, yes! I always claim that I haven't been bored in 20 years, but that is only due to some coping strategies I developed.
I'm probably not the inly INTP for whom repetition means torture. Back in school there was no homework I hated as mucb as "transfer these 20 sentences into the past tense" and the like. I started varying my handwriting or even changing the color of the pen, even using very long and compley sentences as examples for certain grammatical phenomena to build little stories out of them... just to give it some form of variety. *moans*
I started a dozent hobbies but never really systematically went through with any of it. I do finish a book once in a while, but the normal thing is to read 4-5 at the same time or to start one, drop it, start another one, drop it, rinse and repeat. Right now I am officially reading three novels at the same time and have three more text books on my night table that are waiting to be worked through.
At the university I started a bunch of optional classes, many outside my own field, and dropped at least half of them by midterm. When I spent half a year working an office job after graduation it was a slow death. i hated every single day of it. There were many reasons for that but one of them was the monotony and lack of intellectual stimulation (it was mostly administrative work and getting others to do the sort of work I would have liked to do myself). As a freelamcer I at least have a lot of variety of topics (a lot of law, a lot of commerce, some medicine, some food, some engineering, some advertisement) and since I am working from home at my own schedule I can multitask and watch tv and/or read stuff online while translating. And while it might slightly slow me done (I'm aware of that) I do need this additional stimulation, I think. I need to have at least one additional source of input (tv, dvd, forum, news website,...) next to the translation I'm working on.
The main reason I applied for the diplomatic sevice (passed the national written exam but gloriously failed the psychological interview at the ministry) was that they have you move to another country and work in another sector (culture, law, economics,...) every 3-4 years. That sounded so awesome. It's probably a good thing that didn't work, I wouldn't ahve been happy there for different reasons, out but it sounded enormously attractive at the time.
I also work as an interpreter and have a favorite customer that calls for me every few weeks or so to translate meetings with foreign suppliers. The conversation always follws exactly the same script. They are very nice, it is easy money and I feel comfortable doing it since by now I could basically do the meeting singlehandedly and ask the questions myself instead of just translating them. But it has also reached that point where I sort of whidh for some variety, for something odd to happen because these meetings have become so repetitive and stopped being a challenge.
Don't get me wrong. There are strong disadvantages to not being an expert in anything and only dable on a bunch of areas. And I'm not claiming to be supersmart or anything, not at all. I'm just saying that there are many, many things that interest me or in which I can develop an interest when facing them but it rarely lasts. And I am constantly disappointed at my own lack of persistance and low level of skills. It's like there are many things I have put my nose into but hardly anything I'm actually good at.
It's "get the basic concept and move on". From what I have read, this is pretty much picture book INTP MO, so maybe others can relate.
I envy and admire people who have the discipline and strength of will and inner focus to hold a regular job, be great at it and become an authority in their field without going "oh, look, a squirrel!!!" at the first chance they get. People who really master a skill.
The dirty little secret of course in a world with little stability that is oozing with P-style improvisation, a messed up circadian rythm and unsafe freelance work is that I sometime do cling to relief Si as a counterweight. Having a few odd habits gives me something to hold on to in an otherwise rather chaotic life style. It's like a kind of Northern Star.
Some interests (and even fewer people) are part of that Si-ish framework that holds all this mental chaos together.
/tl;dr
summary:
All work and no play makes RH a dull INTP