Adam Glass had a post about his long cycle progress and wrote that:
...pacing is basically standing around with the weights racked. I believe this practice is unsound. I certainly do not need more tissue changes moving me towards a weird posture. All that standing around counts for something…except for more reps, or more muscle, or better cardio. I note the best LC athletes in the world do not rest in the rack for extended periods of time. So my opinion on standing around in the rack is that it’s a fucking waste of time.
Now, I don't agree with Adam all the time, but I think most people who've seen anyone agonizing through 10:00 of jerks with terrible, terrible form would agree that if training resembles that, on even a rare occasion, then that is TOO OFTEN. Unless, you are just training to suck, then beyond pain tolerance, there isn't much you are "practicing" when form is allowed to deteriorate so dramatically.
Now, I've said it before, I believe there are a lot of lessons to be learned in the rack and through "rep expansion", rather than constantly striving for density. On the other hand, there's no reason to vilify speed.