Is Nikon metering that bad that you need to be able to do this all of the time?
Seriously though, it is very impressive. I haven't ever seen anyone deny that. I can only think of one shot that I have ever taken that needed to be pushed anywhere near that far though, and it wasn't an important shot. So it remains a nice to have for me and the bottom of the pile when it comes to the reasons I'd very much like a D750 (it's not insignificant though).
But if you shoot landscape or architecture then you will encounter high contrast scenes all the time so exposing for the highlights and pulling up shadow detail is a daily occurrence.
The rescuing an underexposed photo (flash failure for example) is a happy bonus.