I know there are a lot of people that swear by the park hopper and a lot that absolutely refuse to spend the extra money, so it can definitely be done either way. If you get it and don't use it, then I would suggest that you stop getting it... Disney gets enough money as it is... no need to give them more
However, a lot of people are not aware that you can add the park hopper option once your at the parks if you decide that you do want it. You can upgrade your tickets within 14 days of their first use, so get the tickets without the park hopper option initially. If you get down there and decide that you really do need to hop, then go to a ticket window and add it then. If you never need it, then you didn't waste your money on something you didn't use.
HTH,
Brett