Well, it's nice to be able to avoid water on the leaves, but it's kind of hard to avoid water from rainfall unless you are growing in plastic tunnels. I don't worry about it, and use daconil a couple of times during the growing season before tomatoes start turning ripe.
I would have to invest way too much money in soaker hoses to have enough for all my beds, and my water source is quite a distance from my gardens to start with. I periodically soak the beds with a hose, or with warmer water from large tubs I keep in the garden (since my well water is ice cold) and don't worry if some water splashes up on the leaves.
I guess if I lived in a climate where it it stays cloudy, rainy and humid most of the time, I might be more concerned. As with so much of this stuff, local conditions will affect your choices. And what about folks who use foliar feeding? Have to wet the leaves with that.
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