Few business, but gradually more and more. The decisions that Google, Monsanto, MSNBC, Fox News, Dow, or even Walmart make are starting to have more impact than US government decisions.
And I absolutely agree with your comment, but per my comment below, I think 100% transparency carries its own risks in making government less effective.
If the UN and large bureaucratic organizations have taught us anything it's that position jockeying gets ruthless when promotions are a zero sum game because of no organizational growth.
Everything the Government does affects somebody in a way that few businesses can. A bad process can literally result in death in some cases (although the third sector attempts to help when Government fails).
People already get into Kafkaesque situations on a regular basis due to either the department's employees not understanding its own policies, or not knowing the magic words to use. The only way to protect against that is to allow people to force the Government to give them information. Personally, I've used FOIA responses in the UK to great effect in forcing the NHS to follow their own procedures (not medical ones, admin ones).