I'm one of those dudes who can eat a gram a day for a month straight.
DXM relieves my anxiety like no other drug, and the anxiety relief lasts a day or two after the high (afterglowing). During the high, I don't need anything but music to be completely satisfied and happy. During the peak of heavy doses, I get a sustained, almost methamphetamine-like rushing, albeit much more confusing and disorientating. Hit of weed and it goes to even an simpler, primal joy, as close to a state of nirvana as chemicals can bring me.
the comedown is great for grinding on mmorpg's 'cause you can't get bored. although I gotta say, I use much more sparingly now, 'cause too much will make you crazy. at least for a little while, but any time spent crazy sucks.