In the past I have been tempted to switch to neutral for a wide variety of reasons.
One vehicle, had a bad transmission mount that was hard to get at with due to age and rust, so the car had alot of vibrations at stop lights that would correct at higher idles/neutral.
Another vehicle, had a stall out issue. Lastly, parking lot traffic on major highways which would be a PITA to sit on the brake all day.
Nowdays with the newer cars, and auto hold systems not really a concern.