At this point Python/Numpy is really the array processing language I prefer to use. You can even use libraries like Cupy to switch the backend from BLAS/LAPACK to Nvidia CUDA libraries, which makes it lightning fast, often improving performance by 100x. And the requirement for arcane runes in Numpy is much less than APL or J.

Also the various libraries and functionalities that plug into Numpy is countless and extremely powerful.

There's also https://futhark-lang.org/ which might be an improvement in writing array processing kernels.