You get the most out of them when working on bigger projects with many files and multiple contributers:

• Version control integration
• Automatic profiling
• Debugger integration
• Refactoring
• Jump to Definition/Parent/Children/Usages of a Symbol
• …

For changing a single file, I’d often just launch a simple editor too.

TIL but that makes sense. What else would it be. It also contains some setup logic that is executed when installing, right? I wonder whether the launcher would just work like that

Well for a .deb, the users would need sudo access.