I dont think this decision has anything to do with the experience. It has a lot to do with prices. A lot of companies dictate the prices their products should be sold for. Apple doesn't want the online stores to be placing their prices too low. The same happens to ps3, xbox, wii, DS, other computers, televisions, etc. I'm not sure why companies do this, but they do it a lot. It also seems like those Japanese stores were lowering their mac prices too low and Apple had to stop them... What I find very weird from your post is the following:
They deny me the convenience of expeditiously finding what I want, picking it up and simply buying it and leaving the way I can with any other consumer experience offered by any other seller of product
That's very weird, because I've found that it's actually quite the opposite. At an Apple store, you are usually greeted by an employee. You can tell them what you want and he/she will get it for you and even charge you right there on the spot. Most stores (if not all) do not have computers right there for you to pick up and then leave, they have to get them from the "back." Best Buy sometimes has some of the cheaper laptops for you to pick up, but it not that common. So all in all, I think the Apple store is the fastest if not one of the fastest. And of course the best part is that if you didnt want the employee's help, you just tell them that you are looking and they will leave you alone. Also, most of the time they say something like "Hi, welcome to the apple store, if you need help we are here to help." They dont even get in your way if you dont want to.
I think what I hate most about it is this feeling that I have stepped into an alternate reality. I am okay with this at "theme restaurants" and "renaissance fairs" and the like. It's the experience that people are actively seeking. I get that and it can be fun. But when this experience is a required "rite of passage" in order to own any of their "trophies" (err, I mean "products") I feel a surge of rejection that seems to originate in the vicinity of my stomach.
What are you talking about? Do you feel in an alternate reality when you enter Walmart? Target? Banana Republic? JC Penny? Every store has its own look and feel. The Apple store mimics their own minimalistic designs. In fact, I think this helps them a lot. The only things that pop up in their store are their own products, which is what they are selling after all.