Well I've tried this tickling method today rather than my usual splayed excessive force method.
It is easier and faster, if you pay close attention after one pass like this you can see if it needs going over, in most cases a high flow and one pass add tickling is enough.
I also tried vin's ultra fast ultra light tickle on bug marks, it does work but no easier than scrubbing hard as your brush is going 1000mph back and forth and it hurts your wrist in the same way as touching your private parts that fast would .
Conclusion - a gentle tickle for most windows and scrub the hell out of it where needed.