Like some others here, I use dictation for Texts and Emails most of the time on my phone. Unless it's a very short message. I've found dictation works best for me when speaking in a voice that sounds robotic. Clear and deliberate word pronunciation with slight pauses between the words.
Even though speaking like that is slower than people normally talk, it's still much faster than my clumsy thumbs trying to type everything out. I see people doing texts with their thumbs really fast, I'ver never been able to do it like that. If I could go that fast I'd probably just use my thumbs too. I have no doubt speaking in a slower robotic voice around people would turn a couple heads. So in that environment I usually revert back to the thumbs. 🙂