My reaction to "The Khan baby" is that this is a weirdly fascinating detail which adds to the rich backstory of this film. I wonder if there are such deleted moments which add this interesting facet to other Trek films. Probably not.
At the same time it's very disturbing, there's something macabre about having a baby crawling on a transporter pad--any pad in Trek--much less with the near-detonating Genesis Device on it.
I agree with the decision to pull the scene out, at the same time I wonder what an R-rated TWoK would have been like. And, if Marla McGivers were in the film.