I'll provide the counterpoint since Rev just loves when I do this.
IMHO I'm convinced it's not the tobacco that's improving by DGT, but rather the smoker. Each smoke (even if it's the same tobacco in the same pipe or the same cigar in the same setting) is an experience unto itself. By setting the bowl down for an hour, day, week or month, we fundamentally change the game. What we ate, drank, how we feel about the world are all different.
Have I had some awesome DGT experiences? You betcha. Have I had some disappointing DGT experiences with precisely the same tobacco? You betcha. I just think there's more to the equation than a partially steamed bowl of tobacco sitting about for a while.
Should you listen to me? Absolutely not. I've read enough orgasmic accounts of enough DGT experiences on enough sights to presume there's really something to it. I think my cynical mind just writes it off to luck.
All that said, great post Rev. I'm surely in the minority opinion here.
