I've got a Jamis Coda Elite hybrid and a Habanero cross bike. I use them for different things and they are both great in my application for each. I have rack, panniers and fenders on the Jamis. All in, it's well over 30 lbs. Not fun per se, but it carries a ton of stuff and keeps me clean when the roads are wet.
The Habanero I use on dry days when everything fits in my messenger bag. It's a speed demon compared to the Jamis and I'm glad I have the option of keeping it fast, nimble and fun by not weighing it down with rack, panniers and fenders. Like others, I have a second set of wheels and road tires which turns it into a respectable 18.5lb road bike.
A cross bike is the best of both worlds, a cross bike and a road bike should you choose to keep a spare set of wheels around. Can't turn a road bike into a cross bike.