Mike, as I've commented in another post, no one can play with these phones for a few minutes and understand the reasoning and usefulness of their UI design decisions. It takes actually using them.
I agree with you, but my criticisms for the Sense UI is more out of the latency that I incurred, that is it "felt" more sluggish then when I had my Nexus one.
I owned (and returned) a nexus one and used it up until the time I had to return it, two weeks. I agree that the android UI is so different then the iPhone UI that there is needed an adjustment period, not really a learning curve per se but getting used to how a different OS works.
With that said, my prior experience with android and not really caring on how it work, organizationally. I was disappointed in the fell of the sense ui. People rave over this and I failed to see how it was markedly better then the default android UI. Yeah, the more I use it, them ore I'd see how different (and even better) Overall though I'd want the UI to be snappy and it wasn't