I am afraid that you may not have got this quite right. There are cases where this new feature is a nuisance. For example, if in the heat of battle I forget that what I am copying is a fraction, I go back and type
Command [\frac] not found.
and put in the brackets where I need them. The same applies when editing something which say, I would rather have in "Bold" then the double bracket is less than helpful.
Like you I would be interested in the views of others. It has only really thrown me because I am not used to this feature and there are places where I write equations etc without using the editor or the tool bar.