According to this post in Mint, many people take advantage of their tax return as the means to savings. While the ideas presented in my prior post are things I would do, I should point out that my assumption is based on people not tweaking their deductions so they pay as close to $0 to Uncle Sam as possible.
What makes the most sense, in my opinion, is that you should first take the time to tweak your deductions/exemptions. THEN, use any savings to make sure you pay down debt. Unfortunately, many workers use any extra money and put their focus toward adding expenses, rather than saving or reducing debt.
Take the time out and reap the rewards of either continually paying debt down faster or investing the extra money throughout the year.