It is mostly the nicely integrated defaults of doom emacs. Browsing files, code completion suggestions, code references and search results can mostly be achieve

It is mostly the nicely integrated defaults of doom emacs. Browsing files, code completion suggestions, code references and search results can mostly be achieved with the same convenient keyboard shortcuts, the exceptions are very frustrating. There are quite a few packages involved but they are mostly managed and configured by doom. The default keyboard bindings play a huge role in the fluidity as well.