my favorite is Ctrl+Shift+A which lets you search through all available UI actions (hence the A). That's just so helpful if you know the IDE can do something but you forgot where in the menu structure it was. And to top things off, you can also use Ctrl+Shift+A to look up the keyboard shortcuts for every possible action

I still debate how much productivity I've gained from better AI compared to the loss from switching off WebStorm

But their tab complete situation is abysmal, and Supermaven got macrophaged by Cursor