Im the opposite, probably cause im a terrible typer and rubbish at spelling. I'd much prefer to talk to someone by voice as in a raid it would get me killed if i had to type while i was leading. Its also useful for people to hear your voice as they can hear extra meaning in the tone of your voice to help you get messages across faster, like if you tell someone to do something in a fast urgent manner they know if needs doing fast or if you say something in a sarcastic manner like "hey you, jump off that cliff over there" they know not to do it 
I would suggest just to start talking in all the games you play until its natural to you, you'll soon get used too it and will wonder how ya ever played without it.

I would suggest just to start talking in all the games you play until its natural to you, you'll soon get used too it and will wonder how ya ever played without it.