I do machine learning and computer vision in python, statistical analysis, plotting, and anything to do with dataframes in R, and computational stuff, network science, and almost everything else in julia. I would like to switch my data analysis stuff to julia but waiting for libraries and functions to load is just too frustrating when I'm doing things interactively. I'm hoping Julia will have a good machine learning, computer vision, and data science environment in the future and it is looking like it will. But for now, it is not an easy environment to work with in these applications and you'd need some fairly specific needs to justifiably use Julia here. But the thing is that when you do have relatively esoteric things to do in these applications, it is much easier to do them in Julia.