1- Yes, albeit very rarely. Used it maybe 2 or 3 times. Last time I remember having to use it was back when Titan Extreme was still new content and the healers were both down. I was still back on Excalibur at the time lol.

2- Kinda off and on, but in my experience I'd say it gets used more often than not. For the few that don't use it I think some people just get tunnel vision and forget it's even there, or are just too timid and shy about using it.