The mechanic itself is extremely fun to play, and with some investments in gear, you will be able to take down any Boss in the game. By increasing Herald of Thunder's damage, you basically can run around and kill most of the enemies with the HoT's Lightning Strikes itself. The following Herald of Thunder build is currently the best example of such a build that utilizes the Storm Secret Unique Rings that increase the frequency of Herald of Thunder's lightning strikes, and triggers them whenever you Shock an enemy. In practice, it should allow you to simply run through Maps without using any skills (obviously you will use some, otherwise you wouldn't be actually playing, would you?) while everything dies around you automatically.
Auto-Bomber is a very specific type of build that utilizes Skills that are either triggered automatically or deal damage Passively.