Hey Pete,
I follow your confusion, I happen to be raised without DIR but soon found myself down the street from what I think is one of the largest DIR shops on the west coast.
If you want to know why people look down on it - get on the GUE maillist - I swear you will be getting off in a week, oh, and don't even mention that you are a PADI diver there... This list truly makes you wonder why these people even talk to each other.
On the other hand, these are the people who dove on Brittanic in '99, in the middle of a shipping lane... Lane was close for 7 hours per day while they were doing it - 40 minutes on the bottom, 6 hour deco and then get you *** out of there...
I think this could have been accomplished without DIR as well, but these guys were comfortable this way.
The cool thing bout DIR is that it is a standard that allows you to always configure your gear the way your buddy does it, the bad thing is you MUST configure your gear the way your buddy does it, but on the other hand, that's the way all other DIR divers do it too...
My opinion -
DIR has some great points, but it also has become a marketing thing for a couple of companies, but I have to tell you that you will have to pry my cannister light from my cold dead fingers before I give it up for one of the little things they sell in the dive shops these days, I bring the head light of a car to the party, most people I know bring a little candle in a ziplock bag...
I think a good way to approach things is to look for he Hogarthian stuff, which the DIR setup is based on, at that point you are still talking common sense and not a lot of religious fanaticism - and I think even DIR divers just want to be safe.
Well, I think I have typed enough for one afternoon, gotta go check tides.
Terkel