A little geological perspective - time is the major factor. Yes, some microbes consume organics - good thing, too, or the remains of those dinosaurs would sure stink. Right, microbes do the job - but it does take some time. Standing downwind from a brontosaurus cadaver, some hundreds of millions of years ago, it sure STUNK.
Same with the gulf oil - yep, microbes will do the job. But, as others have already said, time is the major factor. Sad when an article implies 'no problem - microbes will do it all. - just media hype.' Tell that to an oil-drenched pelican or nesting heron or a bed of oysters.
Perhaps geologists have a different perspective of time - hmmm - "the Tetons are blocking the sunset - no problem - every raindrop is eroding them down - they will solve my problem" And they will.