Thank you for your feedback Steven. I actually *am* a fanboy, to the point of being derided by my colleagues :-)
http://psy.cns.sissa.it/perso/lucapapers/CrashBlindness.pdf
I think I understand the reason behind many of the changes Apple introduced, including many in Lion, although surely less than you do. I have the highest respect for what Apple has done in terms of improving my daily life, which basically consists of constant interactions with the computer, and I know for a fact how smart people are there at Apple.
But this is really a very clear one: write a 40 pages paper and sift through the changes. How are you going to find the one you are interested in? The only way to mark "significant" versions now is to save them as separate documents and go back to them manually. This is basic usability. To expand on the problem, although I cannot do it here completely, there are several other aspects that should have been taken into account and I don't see them considered with autosave and Versions. For example, I run psychological experiments for a living. When they run, it is crucial to have a control of the computer processes, as much as possible. This this is in principle impossible in a preemptive multitasking system. However, my experience is that OS X behaves better than any other system in this respect. It is less intrusive and more careful about when it decides to interfere with your work. Even aggressive processes (e.g., spotlight indexing) behave very well, and can be suspended when necessary (for example, by excluding a folder from being indexed when you run an experiment). Now, I don't see how to do that with autosave. Am I going to be able to use Lion for my experiments? I am afraid, no. Because I can never predict when and how some experimenter has left some of the programs that implement autosave running in the background, thus risking to slow down the machine in critical moments of an experiment. That's not good, and again, it's very simple to just give people ways to decide how and when to use these features. Apparently, the decision has been made not to let people do this in Lion. Result: I won't upgrade my experimental machines to Lion.
(As for the magic trackpad: off topics, but it was a great idea. I had a full gesture keyboard produced by a company that suddenly disappeared some years ago. It was bought by Apple. That's where gestures comes from. I was left without an efficient way to type without having my hands hurting, but I was happy to see gestures entering within the system. This part is very well programmed in Lion, although even there, a bit inconsistently throughout the very same applications Apple ships. So you left-swipe two fingers to turn a page in iCal, but you cannot left-swipe to turn a page in Address Book).
Oh well. I stop. Promised.