I don't really see how Lion is like iOS like everyone says. The only thing similar is Launchpad which you don't have to use. There's no more bouncing and floating than previous versions. I can see how the slow pop up windows are annoying at first, but really you get used to them after a while. The shortcut to spotlight is still Command + Space is it not? You can always map it to anything you like anyway. The only deal breaker I see is Mission Control and it's new design of Spaces. I feel for those who used Spaces a lot in previous versions of OS X.
iCal is extremely annoying with the calendars hidden behind a popup button. May be usefull on an iOS sized screen, but not on real screen real estate, especially not with many groups and colleagues with their own calendars. There's no longer a mini calendar. And it's fugly.
Pages is horrible now with autosave and versions. Everybody I know works of old versions, which autosave now happily destroys, and you have to sort of guess what the intended state was once you're too late to make a duplicate. Even if you nake a duplicate, you still have to close the original, and worry about wether you made unintended changes to it.
Having "Don't save..." was so much easier, it's ridiculous.
Autosave in keynote is even worse, because our Keynote presentations get really big, and the autosave proces actually disrupts your ability to work in keynote while it is autosaving.
Files stored on a file server (which, in a pro environment is every file) get auto-saved, but versions are only kept for local copies. So the computer automatically saves your files, but offers no way to restore if you mess up, other than a time machine backup, which may been an hour old. Another huge slap in the face for pro users.
You have to remember to uncheck the stupid "reopen apps" button at restart/shutdown EVERY time, or face the ages it takes to wait for Indesign, PhotoShop and VectorWorks to reopen all of my CAD drawings and impressions I was working on
yesterday
There's no longer an efficient way to exposé switch between all open windows, so getting at the right window now takes longer. Since I switch between documents many many times a day, this one really adds up.
Safari's download window (button) is pretty much useless now (I switched to FireFox, so at least that one's solved) Lion is actually making me consider going back to MS Office with the whole autosave disaster.
Generally, everything an experienced user could accomplish in one or two clicks now seems to take one or two clicks more, without offering any benefit at all that I can see.
it's slightly slower, uses more RAM, it's less stable and for what? A more purty animation of a dialog box?
no thanks.