I pinch back fuchsias, this means flowering is delayed a few weeks but you end up with more flowering shoots and therefore more flowers. I pinch back the odd shoot when deadheading too, but not all at once because that would slow down flowering.
My sister used to trim her penstemons with the Chelsea Chop but this year she's trimmed them all back to the soil level growing point and they've come back lovely - good strong straight shoots rather than whippy stalks that kink.
At the mo I'm trimming my unruly shrubs every couple of weeks. I started by cutting back to a growing point. When new growth was doing well I trimmed them again which caused more new growth further down. So far I've reduced big shrubs by 6-8 inches and got more luxuriant growth. This is an experiment, I did it only on shrubs that were destined for the compost bin.