Some people like it, but if you are into maximizing range, you are better off coasting like the dickens Dan avoiding regen rather than maximizing it. I find that when I'm in L, it causes me to lay on the accelerator longer until I get to the perfect point to be fully off the accelerator and highly regen until nearly stopped before pressing the brakes. In normal D, I tend to release the accelerator much earlier and coast like crazy, and sometimes by the time I get to the stoplight, the light has turned green and the traffic has started moving again.
What really gets me is seeing people accelerate to get around me while I'm doing a long coast towards stopped traffic, then watching them brake heavily only to end up at nearly the same place where I'll gently roll to a stop - all wasted Dino juice. I'm certain that I'm gaining some range with my coasting technique and it has also transferred into farther range while driving my ice vehicles. If only volts were equipped with the funky shifter of the bolt, I wouldn't be shifting to N all the time using pump and glide... but only when first paying with the car and trying to figure out it's capabilities.
For some odd reason, after exactly 2 years of volt ownership, I did a Jekyll and Hyde and slapped on 18" wheels, cooler looking tires, stopped driving like a grandpa, and just enjoy the ride driving more like Jeff Gordon - taking on any and all pony cars and rice burners at stop lights.