Its not so much about the time saved its about being allowed to stay in a mental state of flow since all actions in Vim and similars are built from foundational navigation language chunks. It feels less like editing and more like communicating. All these random little "I can do this command" is just people trying to show examples of how the language of editing to do weird and interesting things. So the answer isn't so much "I work faster" in Vim as it is "I work with less mental overhead in Vim"