I don't doubt that there were many who resisted disc brakes when they started putting them on cars!

And yes, I do understand that a car and lightweight bike are two entirely different worlds.
I bought a Trek CrossRip in January. To me, it is an inexpensive, relaxed geo road bike with discs.
I've never owned a high-end bike so I can't compare it with the best calipers, but even with BB5s the disc braking is magnificent! The modulation/control couldn't be better; the harder your squeeze the faster you stop, period, unlike calipers that hit a max braking level that doesn't increase with more pressure. They're not even slightly grabby, unlike some calipers I've used.
To me the best thing about discs is the consistency and control; the linear operation no matter what the conditions.
We've all had those moments when we soiled our drawers 'cause we were death-gripping the brake levers and just weren't stopping fast enough. That has never happened for me with these brakes (knock on wood!) I feel much more comfortable riding around town, in traffic, knowing that at slower speeds I can stop almost instantaneously.
My bike came with "sissy" levers and just one finger on those will initiate powerful braking. They're not WW but I love them because even when I'm on the tops I'm not far from the brakes if I need them.
I joked on another forum that I'll be blowing past everybody on the descents, 'cause I've got such amazing brakes!
I'm in the planning stages of building a tourer with discs. At this point you'd be crazy not to put them on a touring bike.
Final thought: The teenager that works at the LBS told me that the first time he went down a long descent on his mountain bike, the front rotor turned blue! Wow.
