When you turn it off and on don't you have to go through kinda a setup. Every time you turn it back on. Google Now turns on you're location history, checks report from this device, ect.
That's how it was for me when I turned it off to see the difference in battery life. There is a difference but not a big enough one to turn it off and on and deal with the settings.
I do however "wish" it was that simple. That way I could turn Google Now off and on anytime I want. Without having to turn off the location history, un check report from this device. Then... THEN! turn off all the cards I don't use, same goes for notifications, ect.
It would be cool if Google changed Google Now so it would keep all you're settings the same. That way you could turn Google Now off and on as you please.
OR.... Google optimize the battery drain Google Now uses. That way we would never have to turn it off since it wouldn't be worth it. Because the amount of battery life it used would be so little it wouldn't make a big enough difference.
I still do feel however. That you should be show to turn it off and on without loss of you're former settings.
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