For what it's worth, I had my 2002's break at 105k (neglected it, same story as you), but it broke literally as I was coasting (I have a manual trans) to a gas pump, so it was idling and not fully revving going down the interstate. I replaced the belt and had ZERO issues, so based on my own experiences, it is a non-interference. Please take that with a grain of salt because I feel I lucked out by it breaking while it was just idling versus revving at 3k rpm's, but like I said, mine was replaced and I had no issues whatsoever. I have 118k currently and still no issues. Hope that helped.
2012 Mustang GT Premium|6-speed|401a|Grabber Blue|Brembos|Navi|Rear Camera
2002 Sportage|5-speed|4wd|128k miles (Sold)
1978 Triumph Spitfire|4-speed|69k original miles|Pacesetter Header|Monza Exhaust