Mr Shake, I think what was meant by that comment was that when you enclose your hops in a tiny sack (not a paint strainer) you are packing everything together so they don't have the same surface area effected by the beer. So, when using sacks like the kind you have to tie up, you definately lower utilization.
I myself don't worry about it. Too many people I see homebrewing are extremely paranoid about sediment. I toss all my hops right into the boil without a bag. Along with everything else I may be putting in the brew. When I transfer to primary, I dump the entire pot through a SS Strainer into the bucket. I suppose if you're using carboys for a primary it would be a little more difficult. By the time you chill your wort, most of that stuff should be in the bottom of your kettle anyways, so it's not difficult to dump.
Anyways, I find that this aerates my wort extremely well along with removing any sludge. By the time my beer hits my cup, it's crystal clear (I keg).