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That's a better way to accelerate, yes. Once you're up to speed though, your pumping losses are pretty much a function of gearing, unless you pulse and glide. On the highway, many on here will accelerate under high load, then throw it into neutral (or shut the engine off) and let the car coast for a while, rinse and repeat.
In my Insight pulse and glide helps very little, since it has a small engine with very tall gearing - it's already running at high load most of the time. In my previous car, which had very short gearing and a large engine, I found that if I was very determined with my pulse and glide, I could improve my highway economy from ~30-35 at steady speeds, to 50+ by pulsing and gliding.
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