Sedation Dentistry? What's the deal?

In about 6 months or so, barring real employment of my own, I will get benefits from my girl’s job. When that happens, I intend to get a metric buttload of dental work done.

I keep hearing about “Sedation Dentistry”. I guess the deal is, they do a bunch of work, like several visits worth at once, while you are under twilight anaesthesia.

Do I understand this correctly, and has anyone experienced this yet?