I have, too. For me, personality of the service is one of the reasons why I'd eat in a restaurant so I didn't think it would work out (yet), but I'd gladly be proven wrong here.
I like what the Bubba Gump Shrimp Co does in this regard - a simple red/green two-sided sign that you flip to red when you want a waiter, otherwise they will ignore you. Beautiful.
Which brings up another thought: Does a party tip less if they do the ordering themselves?