"What you need to understand about [voice] dictation technology is that it doesn’t necessarily improve your writing skills, nor can it correct grammatical errors, or write complex sentences for you. Apple’s dictation program and Dragon Dictate can only capture what you say, and type it for you.
While these programs can type faster than you can manually, it doesn’t necessarily mean you will produce documents faster. Where the process slows you down is that you have to think about what you want to say before you say [it], and you also still need to rewrite and revise what you dictate, as you would do with manual typing and writing..."
Via Ana Cristina Pratas