My main reason for even using map mods is the chunk boundaries a la Rei's minimap. The boundaries help in the sense that since you can tell where one chunk is easily you can focus your builds so all of your machines are within a certain boundary to save on chunk loaders. It also helps in that you can make it so, for example, a combustion engine or boiler's water source is never unloaded while said boiler or engine is loaded.
Edit: Also, is the version that's up the updated one that Wyld has mentioned?
Wouldn't NEI's F9 view or Immibis's Dimensional Anchors F9 view be a much superior way to judge this?