As long as the yeast is still within its "best before" then there is plently of viable yeast cells along with nutrients to allow it to get off without too much lag time by just sprinkling on top of your wort.
The other alternative is just to hydrate the yeast by mixing it with some boiled and crash cooled water (theoretically it should be distilled water). You can do this half an hour before pitching. This gently wakes the yeast up, brings it up to temperature and also allows you to give it a bloody good sniff to check it is fresh.
I used to do the latter but to be honest I now just to the former.