The reason it is superior is because it allows far more information to be sent in the same packet sizes. Each channel now has the capacity to broadcast four different signals. Soon, as each network begins to work within the new benefits, where you had one channel you will have four with different selections, maybe one for Spanish, maybe one for a kid-friendly show when they normally wouldn't show them.
Again, if you are NOT getting a good signal, all this if for nothing. Unless you're in a prime zone next to the broadcaster, digital stinks. Also, who said I wanted all those extras? I had VHF, UHF...daily news broadcasts, PUBLIC Broadcast, etc. that carried all that you mentioned. I can only watch so much TV and so many programs.
As far as the military using it, as far as I understand, it is ambulance and police that will get these frequencies to use so they can have more room and work better together. Since they will be transmitting largely voice the limitations will not effect them as much.