You are one of the few people that gets it.
When hydrogen becomes a more efficient way to power cars than gasoline, it will be used. If that was the case now, we would already be using it. That will be the case when oil is no longer the primary source of energy, and that will only happen when something else is cheaper than oil.
Even then, the solution isn't H2 it's nuclear. We might use it then to store energy, but that's not what most people on this thread are thinking of when they say it's a solution to our energy problems.