I had a psycho pedestrian shove me into a bridge railing on a shared cycleway last year. I also had a spill recently at 50km/hr (~30mph) on some oil. :o
Each time the bar end saved my fingers and hand from from some potentially nasty damage - especially the last time, judging by the depth of the scoring on the bar end's outside face. :eek:
I don't seem to need them as much for alternate hand positions these days - maybe I'm getting stronger - but for flat-bar bikes I reckon they're a very useful safety device.
The other recommendation I'd make is to get a decent set of cycling gloves. They look after your hands both on the bike and in the event of a crash, and make it much easier to hang onto the bars securely when your hands are wet from perspiration or the weather.
When riding in peak-hour traffic as I often do, it can get quite busy with gears, brakes and steering all going on simultaneously. Trying to deal with that with wet slippery hands is impossibly risky. Forgot my gloves once and it got to the stage where my forearms got so fatigued from the effort of simply hanging on I just couldn't do it any longer, right in the middle of the steepest and fastest part of the route. 🙄