Heck no! I talked with my babies from the time they were born. I taught them to communicate via the language that was in our household: English, and to start that communication through sounds and forming their mouths as we 'practiced together'. Both my kids were early, early talkers and people were amazed at the 'full sentences' and conversations that they were having at an early age.
Sign language has its place and value-if my child were deaf, or hard of hearing, and they could not hear sounds that I was mouthing, then of course, because it would be appropriate.
The rest of the stuff...more work for what? Not in agreement with it at all and I'm sure I'll get plenty of 'thumbs down' for my opinion.