> For me at least it’s a small but consistent productivity increase over any of the alternatives I’m aware of
Have you tried Eclipse CDT?
Since nobody mentions it, I guess I have to. It takes some time to set it up (system paths, etc.) but once you do, it makes browsing and refactoring code a breeze.
It works much faster than Intellisense and stuff like dependency trees (call hierarchy, etc.) are much easier to navigate.
I'm using it as my main editor since 2014 or so. Have tried various alternatives on all 3 platforms (Linux, macOS, Windows), but I always go back to it for C++ dev.