My first visual of accident happening was as a passenger several years ago during Bike Week.
A car cut over into a bike forcing him into the medium, bike flipped, rider flew off. This happened behind us, the scraping of metal caught my attention and I turned around. Friend heard, but didn't see anything, he was focused on traffic.
Still have that memory in my head. I don't think the guy was hurt badly, within 10 minutes everything was cleaned up and gone.
Few years ago, driving home from a race late at night I saw the semi in front of me swerve, it was a dark stretch of road. I started changing lanes.....then I saw what I first thought was a trash bag of clothes, no it was a person. About 1/8 mile up the road was a bike on its side and the rider laying to the side. Other vehicles were stopped, ppl running back to the passenger.
What still makes me feel a little sick is that I was so close to running over the passenger with the wide az trailer that I was towing! Fortunantly there was a police officer with a car stopped in the oncoming lane just on down the roadway. He had a quick response.
Last Fall, had a little slip and slide incident of my own. Crashed, just didn't hit the ground! Stupid me, locked up my rear brake (just barely) but I was in a curve with a lot of crack sealer. Both my front and rear tires were on/off the slick as ice crack sealer. Started to high side a little, then went low side, then straightened right out and stopped right behind my riding buddy where someone would normally stop.
Almost running over the passenger made me a little nervous on riding on the interstate on the first trip out of state after. Butterflies didn't last long, maybe an hour.
My own near missing the ground has stayed with me still. I know part of it was my own fault. We all make little mistakes at times, it happens whether we admit it or not. The seal crack being slick is something that we just have to put up with in Indiana. It is everywhere
The next day I jumped on my bike and road a good 300 miles on my own on the interstate to a race. Had originally planned on taking state hwy's and back roads. The "almost down" happened while we were out riding state hwys/roads so I decided to change up the type of road I was riding. It helped a lot, I was able to just sit back and cruise the interstate relaxed.
I have become more vigilant "again" about watching for seal crack. I know that I was getting a little relaxed about watching for those slick spots and trying to stay off if possible by changing my lane position a little.
More enjoyable riding time in the saddle seems to be the one thing that gets me over those feelings faster. Learn what you need to learn from your experiences. It doesn't mean staying off the motorcycle. All of it can make you a better rider if you use it.