Yes I do, it's in my diagnostic report.
Reasons:
1. I can edit the written word to improve it, but when I speak, there is only the first draft, which can be pretty naff.
2. My short-term memory (or perhaps my interest in my own ideas) is often so poor that I forget what I was saying before I've made my point, and having it written down helps me to remember.
3. When I speak to people, they often interrupt me as soon as I hesitate, which throws me. It's been a particular problem with competitive opponents such as health professionals, benefits adjudicators and bosses. There seems to be an idea in society that when there's a conflict, people should argue it out verbally like honest, real men instead of hiding behind written stuff and buying time to concoct disingenuous arguments. Our prime minister has been called a coward for refusing to verbally discuss election issues with his opponents on live TV, as if such discussions had anything to do with objectively deciding who to vote for.
4. I often mumble.
5. I'm alone when I type, so I'm more likely to be calm and clear-headed, I can choose a calm time, and I don't have to worry about body language and all the other distractions.
It's hard for me to see that the spoken word has its own advantages, though it does. Theoretically, I can dynamically adapt my verbal stuff to suit the reactions of the listeners, so I don't over-explain, or bore or upset them so much. The spoken word always looks messy to me, and truly it's not often as coherent and clear as the written word, whoever the source is, and I get hung up on that, but messy things seem to make the world go round somehow.