@Kahuna - most of the videos you posted, the person "blobbing" had a massively superior force to the losing player, so he could afford to simply keep them all in a group and A-Click to win. None of the videos you posted were using professional games as far as I could tell either, so there's never been any argument that the lower level of play is inclusive of blobbing.
http://www.youtube.com/watch?v=nRlPUN73uXo&t=8m48s
In this one the Terran's army is vastly superior to the Protoss Army. Also, the Protoss doesn't have any of the "anti-blobbing" spells they would need to defeat this force: The two primary ones being Psionic Storm or Force Fields. Therefore considering the Terran's vastly superior economic force, blobbing made for an easy win. In pretty much any strategy game I know (except maybe Total Annihilation), A-Clicking into an enemy's base with a vastly superior force
will win you the game.
http://www.youtube.com/watch?v=nRlPUN73uXo&t=8m48s
Once again, a case of a massively superior army blobbed against a crappier one. To be honest, if the Terran player had separated his units a little better he might have lived longer, but he didn't stand much of a chance either way. 2 Colossi, 2 Immortals, and a small group of Stalkers, Sentries, and Zealots, vs. a handful of pure Marine Marauder is going to be a massacre.
http://www.youtube.com/watch?v=0-QupXMBzsU&t=7m19s
Another massively inferior force blobbed against a superior one; he even comments on the danger of expanding too quickly. As you can see, the Terran player even surrounded the Protoss Army in many places, pushing his first wave back with a force that never should have been able to do that. So this video to me shows how effective micromanaging your units can be.
http://www.youtube.com/watch?v=8neoxqAdUaQ&t=6m37s
How can you say this one was blobbed? The Protoss player had to create every Forcefield almost simultaneously in that situation. Also, army was vastly superior in terms of cost and the Terran player shouldn't have tried to fight around the Force Fields.
http://www.youtube.com/watch?v=ziWA1tTIvy4&t=6m13s
Massively superior force, no comment.
http://www.youtube.com/watch?v=w7LVhDHj9o4&t=7m16s
Don't know how you can say this was blobbing. This was a mixture between abusing an elevation mechanic to exploit the Marine's small range, constantly warping in new units, and also having a vastly superior army in terms of cost. I don't know if you understand this, but Marines cost 50 Minerals, that's it. An Immortal Costs 250 Minerals and 100 gas. The cost of 1 Immortal is basically the cost of 7 or 8 Marines. A Stalker is 125 Minerals 50 Gas, that's basically the cost of 3-4 Marines. A Sentry costs 50 Minerals and 100 gas, that's about the cost of 2-3 Marines. If the Terran's army of Marines and Marauders does not handily outnumber the Protoss force, they are in trouble.
http://www.youtube.com/watch?v=6DUvgUSCzKc&t=6m5s
Zerglings used to surround Probes and Stalkers...I don't see a problem here.
http://www.youtube.com/watch?v=N-7fNNdt5IM&t=7m34s
This is probably the worst example you gave, do you not see him individually blinking back his Stalkers when they take damage? Or blinking back his army when they're in trouble? There is a lot of micromanagement going on here.
Your videos fell into 2 categories:
1. 1 person's army is so vastly superior it doesn't need to be microed.
2. A person's army is being microed, you just don't realize it.
This is what happens when you blob in pro games:
http://www.youtube.com/watch?v=MFIy83PLFR8This is what it looks like when pro players micromanage:
http://www.youtube.com/watch?v=CdSKD3LRHV8