Recently Ravanel wrote on her blog about her experiences as a guest in a Star Wars the Old Republic stream. In there she pretty much explains why she prefers to blog rather than stream. Part of the reason being how exhaustive it is for her to use voice chat for hours. (Do go read her post, she explains it much better than I could in a paragraph).
I did end up commenting on her post with my reasons for disliking voice chat. Once it was finished I realized it was big enough to make a blog post and so with Ravanel's blessings I decided to put it here too, with some editing and additions.
Now, just to be completely clear, I am not claiming that these are the reasons for everybody who hates voice chat. These are mine. Other people have their own reasons for that feeling. I also have nothing against anyone who likes to use voice chat. To each their own, as I always say.
With all that out of the way, here are the reasons I tend to avoid voice chat in games: