That's funny, because this is what I really like about Scala; how quick and easy it is to get a project started.
> sbt new scala/scala3.g8
will just create an empty project. If you don't even want to bother with a project, use use scala-cli or ammonite (http://ammonite.io/) to just start banging out code.
Even the upgrading of a project from Scala2 to Scala3 is a breeze, thanks to very good backwards compatibility of new library releases.
I think there installation of the required tooling is very easy and just works, unlike other languages where you can spend a lot of time just getting all of that initial stuff setup. Also upgrading the tool chain is very easy as well.