While I think voice chatting is very useful, especially in dungeon situations, I don't think people should let that prevent that from chatting. I try to do both, if I am TS with the linkshell. The only time I don't is if I am on Skype and partying with friends from university, but even then I still try to pay attention to the in-game chat.

While I do not think voice chat necessarily leads others to ignore in-game chat, it is really dependent on the person. I try to do both and I think in general people should try not to ignore it. Sometimes in-game chat is the only way to ask something when TS is busy too.