How relevant is it that today marks a new decade?

It is now 2010 a new decade, how much does that really matter? I had not even thought about the concept then the news and other media outlets started emphasizing the start of the new decade. Does it matter? The only reason why today has any meaning is because way back when some one decided we needed to measure the passing of time. My cat don’t care one way or the other, she knows the sun is up, or its not. She just knows she is hungry and it is close to the same point the day before and when is the large “hairless ape” going to put food in the bowl? Being that this is a significant supposing metering of time did you think about the 1st question you posted as the 1st question of the new decade and seek to make it relevant or just made a question for fun, because it really don’t matter?