Now, if I miss a call, it forwards to the GV number. So I get transcriptions (via email) which aren't perfect but better than anything else I've seen.
9 times out of 10, I don't need to call the person back. It's a reminder, it's somebody I'll see later that day, etc.
I do wish that GV would not send me notices that I have voicemail when the person (or more likely a computer) hung up when they heard voicemail.
The GV number is also useful for things that insist on SMS where I want a secure number. No way for a person to go into a store and insist on getting my number transferred to their phone.