how can you be bored ? well it's 0745 am there is 1 helicopter between 3 instructors and you have to pay for the tea, it's now 1930 you have done maybe 4 hrs teaching, your students are pissed off cause they cant get the machine for long enough to do what they need to, the management are on your back to do more flying, the locals are complaining about the noise and you still cant get a free cup of tea why would it be boring.
I am not saying that instructing is boring but banging your head againts a brick wall is.