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That is because overall, the technology isnt advancing. Its stagnant. Its a rehash of the same technology over and over with very minor tweaks. You think the technology has changed leaps and bounds but it hasnt. Its just slowly refined and the reason you see marginal improvements with the quality of your images.
By taking a small portion of what I said out of context, it becomes convenient for you to ignore a main point of my earlier post. While it may be the case that "improvements" are largely incremental from one generation of camera body to another, the accumulation of those incremental improvements over a span of less than 10 years has been both amazing and remarkable, and one of the best examples of that remarkable progress can be seen in comparing, as I did, the 10D to the 7D.
With a generally matured technology, not only do I not expect continuous revolutionary changes, but I also find it difficult to understand how it could be reasonable to be disappointed by the absence of such continuous repeated revolutionary change. Further, the evolutionary and incremental changes in Canon DSLRs are a sign, to me, that the technology has come a long way and that, at its current level, the cameras we are using are able to do a remarkable job of helping us to get the pictures that we want to get. And assertions to the contrary do come across as mere complaining for the sake of complaining.