It saves real time if you write your code the way IntelliJ wants you to write your code.
If you structure things differently - say, by steering clear of subclass inheritance, or keeping interfaces small, or not using the Bean pattern, then you can pretty quickly discover that there aren't all that many IDE refactorings that you actually use.
At this point, most the refactorings and code actions that I'm actually using exist in vscode as well; IntelliJ's main advantage is that I'm (somewhat) more able to use them efficiently without taking my hands off the keyboard.
If you structure things differently - say, by steering clear of subclass inheritance, or keeping interfaces small, or not using the Bean pattern, then you can pretty quickly discover that there aren't all that many IDE refactorings that you actually use.
At this point, most the refactorings and code actions that I'm actually using exist in vscode as well; IntelliJ's main advantage is that I'm (somewhat) more able to use them efficiently without taking my hands off the keyboard.