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Julia has great notebook support, the Ju in Jupyter stands for Julia after all. There's also the fantastic Pluto.jl for reactive notebooks.

And the VSCode extension isn't quite IDE level, but that's just a matter of resources.

IMO, the REPL is really nice for exploration. I would never write code in it, but it serves as a really good doc search tool and quick way to check things. It helps that the Julia REPL is more inspired by the Lispy ones than python/R.

I used notebooks when I did my PhD using Python, but have moved to the REPL using Julia on my PostDoc. The Julia REPL experience is so much nicer than Python's, it removes the need for notebooks completely for me.

I'm a scientist, I use REPL a ton. Notebooks are fine too, but there's a thing called exploration and nothing beats REPL speed for that.

In future it would be great to mashup something like repl.it with Jupyter notebooks, maybe with Medium-style wysiwyg. That might really win.