it's just one more step in taking out the most dangerous component, the driver.

Some people have modified their throttle linkages with like a knob that when you turn it it hold the throttle at where ever it's at. Kinda an oldschool way of doing it.

At the incredible lame VW T3 Transporters (55 hp Diesel, max.speed 103 km/h), which were in use at my Bundeswehr-service-time 20 years ago, I've used on long Autobahn-trips the mechanical Cruise Control, as invented by the WWII-soldiers in the Russian steppe: a brick on the gas pedal. It worked fine.

I find it indispensable when driving on a highway for a long time (traffic permitting...)
Also I think it's one of the coolest-named car features

As far as I'm concerned I can live without such fancy. Save it for the Rolls-Royce's and Cadilac's. I didn't even know how to use it up until 2010 or so when I was fooling around with it in my mother's car. It doesn't work in my Bronco.
The only luxury I want is my car is a CD player.

My Volvo S40 get it but I'm with Neptune, only for long distances. But even in that case, it's not the same drive in a congested highway to Valencia-Barcelona (some risk to use it, I think) than in the long and straights higways of La Mancha (center-south, spain) or Castile (center north, spain).

I do not have it, but I would use it on highways if I had it.

I use it almost every time I drive our family car (2000 Chrysler Voyager), especially on the motorway. It's more comfortable when you don't have to keep your foot on the throttle all the time, considering the Chrysler's awful driving position (much more upright than I'm used to with other cars I've driven).

They have, and for a while they've been optional. Unless I'm mistaken, they're standard nowadays. And this isn't just from Ford, GM, and Chrysler. The imports add them too, in fact I really don't know of any car manufacturer that doesn't at least offer cruise control. If you've read my profile, you'd realize my car is a 12-year-old Honda Accord, and that has it. My 1991 Toyota Corolla had it, but my '97 Corolla didn't.

I drove a 2008-model Honda Civic Type-R which had cruise-control. I even tried it for a few moments on the highway, I didn't like it much, though.