I use both (not IntelliJ but other IDEs) and quite frankly I fund VS Code and derivatives very much inferior. For C++ development for example CLion vs VS Code (needed plugins installed) is night and day and not to the benefit of VS Code.

I know JetBrain product could be sluggish on "normal" computers however all 4 of my development machines run on 16 cores AMD with 128GB RAM. It flies in environments like that