I don't like using voice chat and won't use it except to overcome a group obstacle that requires in-fight coordination. At least that's the case woth PuGs. If it's a guild I've been with for awhile, most of my guilds require voice chat due to the content they pursue and I'm okay with that. It's sort of necessary if you want to raid or PvP competitively. I'll even join a few guildies in chat for smaller activities like a few dungeon runs or queueing up for a battleground together. As long as I know and am comfortable talking to people, it's usually not a problem, but I will gladly endure the discomfort of having to type in the less active parts of the game if it means I can be more comfortable with my game time. I'm just not a social person, not to mention I'm very shy so I only like to use voice chat with those I know and for important content.