Fair or not, I feel like people who complain about it today (years after it launched) are just announcing, "I'm bad at adapting."
The answer to this is always "no."
Except this time.
It actively encourages exploration. That's good for some use cases, and it's certainly good for Microsoft.
Are you kidding me?
use ms office daily, love the ribbon.
I _was_ a proficient excel user once upon a time but now I feel like I'm trying to cook in my kitchen after some "organization expert" came in and moved all my stuff.
IMO, life is too short to have to re-learn stuff you already know.
The ribbon was annoying enough. But then I started manipulating using shortcut keys. And a subset didn't product the expected results.
I spent some years working heavily in Excel, including extensive on-the-fly worksheet structure modification (shoving data around, adding and deleting rows and columns, copying values or just the "text" portion of cells, etc., etc.). So those shortcuts were second-nature, or "muscle memory", as they say, if a bit stale.
It was a one-off, helping that person. I currently do a little budgeting in Excel, but without much such manipulation, so I haven't continued to trip across and so recall in detail what broke.
I do continue, in my more spiteful moments, to hope they reserve a special level of hell for the people who make such UI changes. For a subset of people, Excel is a heavy-duty industrial tool, and dicking with the UI is tantamount to dicking with their livelihood, not to mention peace of mind. At a minimum, implement and insist on backward compatibility (as an optional mode, at least), no matter how much your "rock star" designers piss and moan, or your Management pisses and moans about supporting multiple interfaces. You have a responsibility to the user base that has propelled your product to such success while integrating its functionality into their subconscious actions.
And that applies whether or not the change has merit. It's inherent in the process. So any analysis of a UI that starts with an "I HATE THE CHANGES!" blog post is flawed and (in the scientific sense) biased. Show some testing, write your own rant, or just sit tight.
If we take what you say is true every redesign is good, which is patently false.
A perfect example is the Office Ribbon UI, an unmitigated disaster. Also putting Vista in your list there, mmmmmm. Wasn't exactly a great redesign was it.
The Google redesign is also pretty much a disaster.