I wouldn't do it. The magazines don't know what the hell they're talking about half the time, so don't listen to them. The eccentric/negative/pliometric portion of a lift is what really causes muscle growth, though, due to the damaging of the muscle tissue that occurs.
Many, such as yourself, will take what I just said and exaggerate it, though. Don't do that! Do a slow, controlled negative (2-3 seconds on the way down) on an exercise. Don't try to destroy the muscle so it builds more. You'll end up extremely sore and it'll just hinder progress with nominal results, if anything extra.
When doing the concentric/positive/miometric phase of a lift, explode through it. Don't do it slow. Do it as fast as you can, while maintaing good form. Learn to accelerate the bar through the range of motion steadily. This will obviously be impossible as you work near maximal weights, but do what you can to keep your CNS conditioned to explosive force development, which will lead to greater force output, which will help you break through plateaus in lifts, which will allow you more progressive loading which, finally, will lead you to more size.