The IntelliJ IDEA plugin for Scala is built by Jetbrains, so it has official support. It has its quirks, but so does the Kotlin plugin.

Sbt is better than Gradle IMO, as it has a saner mental model, although for apps you can use Gradle or Maven. Sbat has had some awesome plugins that can help in bigger teams, such as Scalafmt (automatic formatting), Scalafix (automatic refactoring), Wartremover and others. Scalafmt specifically is best in class. With Sbt you can also specify versioning schemes for your dependencies and so you can make the build fail on problematic dependency evictions.

Scala CLI is also best in class, making it comfortable to use Scala for scripting – it replaced Python and Ruby for me: https://scala-cli.virtuslab.org/

Note that Java and Kotlin have Jbang, but Scala CLI is significantly better, also functioning as a REPL. Worth mentioning that other JVM languages hardly have a usable REPL, if at all.

The Scala compiler can be slow, but that's when you use libraries doing a lot of compile-time derivation or other uses of macros. You get the same effect in similar languages (with the exception of Ocaml). OTOH the Scala compiler can do incremental compilation, and alongside Sbt's support for multiple sub-projects or continuous testing, it works fairly well.

Scala also has a really good LSP implementation, Metals, built in cooperation with the compiler team, so you get good support in VS Code or Vim. To get a sense of where this matters, consider that Scala 3.5 introduces "best effort compilation": https://github.com/scala/scala3/pull/17582

I also like Kotlin and sadly, it's missing a good LSP implementation, and I don't think Jetbrains is interested in developing it.

Also you get all the tooling that's JVM specific, including all the profilers and debuggers. With GraalVM's native image, for example, Scala fares better than Java actually, because Scala code relies less on runtime reflection.

I'd also mention Scala Native or ScalaJS which are nice to have. Wasm support is provided via LLVM, but there's also initial support for Wasm GC.

So to answer your question, yes, Scala has really good tooling compared to other languages, although there's room for improvement. And if you're comparing it to any other language that people use for FP, then Scala definitely has better tooling.