I just have Cursor open in another window for the agent mode while I do my editing with intellij (or other jetbrains products).

I would never voluntary do any editing in VS Code or forks of it. It is just so slugish on large files. Plus there is always subtle things that annoy me, I can't even describe it, it just feels off. I hope Zed takes off as it is a bit more tolerable though still not there yet.