If this bill changes nothing, then there is no purpose to vote for this bill is there?
Imagine a new bill is introduced. "Eating apples is legal." The Apple Pickers Union would love to see this bill passed. The Orange Pickers Union would probably oppose it. They'd both spend millions on a blogocampaign to convince you they are right. But passing (or not passing) the bill changes nothing; it's already legal to eat apples.
No it isn't; having the law explicitly call it out as legal shifts the perception of those activities from being ones that the law does not involve itself with at all to ones that are enabled and authorized by the law.
In other words, it makes things subject to the law that were not previously subject to the law, and so ultimately makes those things easier to constrain/regulate in the future.
"easier to constrain/regulate in the future." Ironically, that sounds like motivation for the EFF to support the bill.
The law with regard to privacy in cloud services is not very well established, but if we allow laws like CISPA to pass, this will slowly but surely make it impossible for any service provider to ensure privacy, even if they wanted to. This will mean that we have to give up all the benefits of cloud services if we want privacy.