Transitioned to clip-less pretty painlessly and have never fallen when stationary / stopped and was so used to straps / clips it wasn't the change it may have been for people who use flat pedals.

Was in traffic one day and pulled up behind a van and unclipped my right foot as I rolled to a stop and am not sure how I did this but caught the clip on the way down and locked my foot back in at 0 mph and could not snap it back out.

Pure reflex kicked in and since I was on my mtb I popped a wheelie and skated my back wheel across the back of the van and then rode right to the curb and hopped up on to the sidewalk.