When I first started making cider, I just tossed it. Now, I do as the packet says. Honestly, I don't think there is that much difference, but if you follow the packet, you will probably notice fermentation happening sooner rather than later.
Make a starter. Doing so will not only wake up the yeast but you will start the fermentation process with more yeast. Jamil talked about it once in numbers and I believe it was around double the viable yeast (twice as many alive). That alone should be reason enough.