Over the years, there’ve only been two people (who I met on ZD) that I didn’t know in real life who have heard my voice in some form. I now have semi-regular voice chats with one of them as they are one of my best friends though this took a lot of convincing, he made me feel comfortable enough with no actual pressure to do it at all that I took that leap faith. And even though I have never had a voice chat with the other person, they too are an extremely close friend who I trust implicitly and would be open to it.
In saying that, I actually don’t like doing voice calls with people I don’t know, which is the same reason incidentally why I don’t play a lot of multiplayer or co-op games. I don’t think there’s any advantage over text since with text I can reread what I’ve typed and then obsess over whether or not I actually want to “say” what I’ve written. Though, in saying that I’m also uncomfortable text chatting with people I don’t know as well, which is why I rarely ever enter the SB. So video chatting is an even bigger no for me. Chatting to people online in general makes me feel anxious to the point where if I say something, there’s a good chance I’ll delete later depending on how comfortable I am with the person. In spite of my one positive experience, I still feel the same way when even text chatting.
And your observation is correct, people do think I’m weird, or that I’ve got something to hide, or possibly misrepresenting who I am if I don’t want to voice chat with them. The only thing I think it truly shows is my lack of trust for other people which takes me far too long sometimes to let people gain.