It can have an impct on group rides. If you keep your eyes on the cute bum on the bike in front of you, there is a real risk you could crash into it if the brakes go on suddenly.
There have been problems expressed by some who have had a bit of an off, that they keep looking for safe escape routes and dont seem to ride as smoothly as they used to. Once they are reminded that they should be looking where they want to go and not where they dont want to be, then their riding improves again.