Simple plots take a fraction of a second in Python/R/Matlab. I feel like many people don't realize how crucial this is. Sub-second plotting makes working with data interactive. If it takes more than 5 seconds to produce simple plots, that's no longer interactive. Imagine if your debugger took half a minute to show you the value of a variable while trying to find a complex bug. You'd start pulling your hair out.
If in Julia it takes me half a minute at least (dumping to text file, reading it in somewhere else and then plotting it), Julia is going to remain firmly in the "check this language again in 2 years time if the plotting story has become sensible yet".
What I do is wait one second for the RCall.jl package to load and then use R's ggplot2 library to plot. Works really well, especially since I am really familiar with ggplot2.
Also pretty much into the unix philosophy whereby tools should do only one thing and do it well.