Your bank wire doesn't leak the balance of your account to the recipient. It is a new and unique problem with some cryptocurrencies. Of course, we have already proposed solutions to problem this with ring signatures, stealth addresses, 'coinjoin', 'zerocash', 'TITAN', etc.

As I wrote, you can simply move money around so that the final transfer doesn't reveal your original balance, e.g. if I have a balance on address A of 30 and I want to pay something that costs 4, I can just create multiple addresses where I move and subdivide the 30 until the last address only has a little over 4.

The recipient has no sure way of knowing that the original address was mine - I might just have withdrawn from a service like Coinbase.