I've been rear ended twice on bikes over ~55 years of riding, fortunately with no injuries. I see far many more rear end collisions commuting now than ever and attribute it to cell phones.
Agree, back in the late 70s / early 80s when the Hurt Report came out, rear ender accidents for motorcycles was not one of the major contributors, but that study was done in pre-cell phone days. Nowadays I see at least 3-5 rear end accidents a week on my 46 mile commute. I have the impression that a large majority of the at-fault drivers are younger people in small cars. Before cell phones became ubiquitous, I would see maybe one or two rear end accidents every other month or so.
I too suffered two minor rear end accidents on motorcycles, both cases were from stopped when the driver behind me got over-eager to go when the light changed. In the first case the guy was driving a small British sports car. I suffered no damage or injury on my Yamaha AT-125 Enduro, he just hit the tire, but his whole front bumper fell off! Second time was on my Yamaha XS750 and the woman who hit me took off when I pulled over and motioned for her to do the same. Didn't notice the damage until a couple of weeks later when riding two up and cars on the freeway were honking and pointing to the rear of my bike. Couldn't see it in the mirrors but when I turned around to look there was heavy smoke rolling off the rear wheel! Turns out my rear fender was dented in and making contact with the tire, but only when loaded two up.
I think I've either been lucky or avoided rear enders in traffic lately by lane splitting extensively.