Actually, I'd say it's the shoutcasters turning off the health bars. You never see replays of the gamer himself because that could cost him performance. Those games are either frapsed live through spectators or they just comment on the replay. So you never actually see the player's settings in a game.
Any pro-gamer worth his salt will tell you that you should have the health bars on at all times.
It makes it much easier to focus targets that are already low and makes it much easier for you to see what unit needs to be pulled back.
And even in macro game the health bars still stick perfectly to the units, so you can still see very well (I'd argue that it's easier with bars on than without) what's going on on the battle field.
+1 for the dream analogy!
Like dreams, there is a good explanation of why you are living your game in slow motion, there is always one thing slowing down everything else. In the case of dreams, it is your brain, that actually dreams faster than your perception. That's why you seem to be slow, because the dream is actually faster than what you perceive.
For StarCraft, this is another problem. I discovered by studying replays that faster players remove one very large part of the time you may take in your game: controlling the army.
As an unexperienced player, you might not be familiar with unit balance. So when sending your 12 zerglings againts those 4 zealots, you don't yet know the outcome. I'm sure you expect some victory, but can you trust this expectation enough to actually leave your zerglings do the work without you?
I often find myself microing too much when dealing with large overpowered army. Yeah, I have 24 zerglings and they meet 1 zealot. Really, no need to micro them, just return and take care of your base!
Your problem may be the same...
Best Answer
The only possibility in my mind is command groups. At a previous time, he selected a batch of probes, held Shift or Ctrl and pressed a number, 1 - 0 (number row only, not keypad). When looking elsewhere, all you have to do is press the assigned number in order to recall that selection.
Holding shift+# adds the currently selected units to the selected command group. Holding ctrl+# creates the currently selected units in the selected command group.
shift = additive
ctrl = replace