This has the effect of making you very aware of just how much money is going to you and how much money is going to the government. With withholding, people never see the money they're losing -- hard to miss what you've never had.
In general, though, increasing withholding is exactly what I do when I work as a contract employee. But I rarely do that any more. At some point, your rate just doesn't fit into a W-2 kind of pay scale.
I'm in an interesting spot because my income can be zero, nadda, nil, or it can be upper-middle class. It's all up to me and the market. Most of the tax laws, however, are written with joe sixpack the wage earner in mind. So I end up making a lot one year, owing a bunch of taxes, and then when the bill comes I'm making zero. Then I have to choose between paying taxes and feeding the family. Or the flip-side, you borrow money when you're making zero and then you start up a high-rate job and have to spend the first few months paying back loans instead of getting caught up on back taxes.
But like I said, listening to others I'm sure there must be something wrong with me. Maybe I should find a more "normal" job where I could have deductions taken out instead of being so independent entrepreneurial,and self-employed.