Safe and efficient way to keep hands clean while preparing food
Your are following proper procedure by washing your hands after handling raw meat. In the videos you see, the ingredients are usually pre-portioned or are only going to be used once in the preparation of that specific dish. In that case, it doesn't really matter as any that is left over will be thrown away.

At home it wouldn't be as practical to follow this procedure unless you pre-portioned your ingredients. Or you could put small amounts of salt, pepper, rub, etc. in containers, use what's needed, and discard the rest. This eliminates a lot of the hand washing, but I find that it wastes a lot over time.