dB, I think what he's saying is that if you don't have good head generation (however briefly), then wheat won't help. However, if you get copious head (har har) on your beer but it doesn't last long, then wheat may help.
Frankly, I don't notice any better head formation on my wheat beers with 60% wheat in the grist than I do on many of my 100% barley beers. Sometimes my beers have good head, sometimes they don't...I don't think it's related to wheat or adjuncts in my case, just procedures. I even brewed a chocolate stout with 3.5oz of dark chocolate in it (not extract...chocolate!) which I was told would absolutely destroy the head...it foamed up and had head like a champ. My latest Hefeweizen, while quite delicious IMO, has somewhat dissapointing head characteristics for a beer with 50% wheat in the grist.