I found a thread by that title on an online forum called Vipassana Forum—here's a link.
I think it's a pretty good question. For me, the first few answers that come to mind are:

• I'm not as irritable as I would be otherwise. When I don't sit for a few days, I start saying and doing things I really regret.
• I don't get overwhelmed by fear, generally.
• I'm much more compassionate and perceptive than I would have been without a meditation practice.
• Meditation sort of gives my life "context"—not "meaning," but a sense that I know what I'm doing here and how the whole thing works.

I'm sure there's more, but those seemed like the first few answers that came up.