I would say (and last year’s Julia Developer Survey points to this as well), that the most common setup is probably Juno followed by VSCode, not “just a shell”.
It is of course perfectly possible however to run Juno without JuliaPro, it’s just not pre-bundled, i.e. one has to separately download and install the components (which is quite simple for Juno thanks to the uber-juno Atom package, and from what I understand also a one-click install with VSCode).
The main difference then is that JuliaPro has a more curated list of packages, which provides some additional protection against breakages/inconsistencies at the cost of lagging behind somewhat, which can complicate getting community help (if the answer on here is “just update to the latest version of package X”)