I blip on some down-changes, particularly if the engine revs or speed is high, but if drifting up to a red traffic light or a stop, I usually don't. Like Glen, it's a bity automatic for me, as I was always taught to blip and double-declutch when driving a manual car, and I often still do it without thinking.
It's interesting that the engineers who design cars will say that double-declutch is not necessary, mechanics will say that it is unnecessary, but driving instructors (in my day) would recommend it, and bashed it into us.