Just in case you have a kid that you think just might take advantage of the situation, a PIN number could be set up for the other phones on your account. Peer pressure being what it is today, your kid might be dared into buying the most expensive app in the store, the $200 gold dice that are nothing but a status symbol that appears on your phone. And if that isn't enough protection for you, Verizon will allow you to opt out of carrier billing by using your MyVerizon account to leave the program.
Not all Android users on Verizon will get carrier billing at the same time, so be patient. Pretty soon you will be able to impulse buy your way through the Google Play Store just like AT&T, Sprint and T-Mobile customers have been able to do.