Definitely a skill I can hone a lot better. I am sure it will dramatically improve if a pump track gets built in Cambridge!
But I think I do a fair bit of it while riding. And I am surprised that in areas on the trails at CamRock where it is more fun to pump through, the main line goes around those areas. You have to know where to ride a little off the main line to get the good pumping lines. There are actually quite a few of them if you know where to look.