I struggled a lot too. I think the main issue is the problem domain in which these languages excel at.
I like compilers, systems programming, distributed systems... but math? statistics? I'm admittedly terrible at that and find it really uninteresting. It doesn't help that most literature on J tries to teach its language concepts showing you how to solve math problems. I have no need for a fancy calculator.
For what it's worth, I like K and Klong and found them very approachable. Basically because you can get away by writing Scheme with m-expressions.
I like compilers, systems programming, distributed systems... but math? statistics? I'm admittedly terrible at that and find it really uninteresting. It doesn't help that most literature on J tries to teach its language concepts showing you how to solve math problems. I have no need for a fancy calculator.
For what it's worth, I like K and Klong and found them very approachable. Basically because you can get away by writing Scheme with m-expressions.