You can't seperate art from technology, not in a technological world. I'm not saying that a great system is going to make a great photographer. But it can help you become better. So yes, you can buy your way into a more pleasing image. Like I said earlier though, it won't make you David Doubilet. But better gear helps.
Here's an example of buying your way into a more pleasing image. Many people dump their P&S systems because of the frustratingly slow shutter lag. They are tired of getting nothing but fish butts. A DSLR, with substantially less shutter lag, can decrease the amount of fish butts you are getting. You still have to focus, compose and light the scene. But now you have one less problem to worry about, allowing you to concentrate on the other issues at hand.
As for a great rig staying out of the way, tell that to the IMAX folks. I don't think their rig stayed out of the way of anything. Yet their footage is astounding. The best rig isn't always the easiest to use. That's why is imperative that no matter what you use you are completely comfortable using it. You have to be able to work all of the controls without looking at them.
This is something I feel strongly about. I'm sorry I have to be the one to tell the truth but sometimes you just gotta cough up the money to get the better shot. I do a lot of guest speaking on photojournalism, nature photography and occasionally UW photography. And especially in nature photography, I get a lot of people who ask "how can I get shots like yours of those little warblers with my P&S?" And the short answer is you can't. You need the gear. The gear costs money. Period.
Take your guitar analogy. I'm a crappy guitarist by most standards. But when I bought a Martin, even though it's an entry level Martin, my playing got much better. Why? Several reasons. It's an easier guitar to play. It sounds better. I was more excited about playing so I practiced more. More practice equals better playing.
Again, I'm not trying to say a great rig will turn a crappy photographer into an award winner. 95% of great photography comes from your brain. But don't discount that 5%.
The point I'm really trying to make is that better gear will even out the technological playing field. After that it's all in your head.