Yeah, same thing here. I didn't realize that the Option+Click made it work, but to me it is still a step into the wrong direction. I understand that it didn't go with the rest of the apps on the way it worked before, but that's because the rest of the apps don't have a mini-player. To make such a widely used resource (clicking on the green button) a two click thing (or press+click thing) is a step in the wrong direction IMO. I wrote to Apple (iTunes>Provide iTunes Feedback) complaining about it, perhaps if enough people complain about it they will make it go back to the way it was before.
The green "Zoom" button has always meant to toggle between "make the window as big as it needs to be" and "make the window the last size the user adjusted it to".
The problem with iTunes (which really isn't unique to iTunes, by the way) is that there are multiple "as big as it needs to be" sizes. If you are looking at the list of all songs, some would contend that miniview isn't at all "as big as it needs to be" because all that information is removed from the screen.
That having been said, I like just about everyone else was a major user of the green zoom button to get to mini viewer mode. It'll take some time before I'm comfortable option-clicking the green arrow to do what I'm used to it doing with no option.
On the other hand, option-click has a major bug: mini viewer now always goes back to the center of my f*cking screen instead of remembering its last position (unobtrusively off in corner) and going there instead. Which is, of course, the most
unlikely spot for it to be useful. Both shortcuts (option-click and View|Switch to Mini Player/command-shift-M) do the same thing here.
Odd that I hadn't noticed that last night. I wonder if something I did today, like using the Home Sharing feature, triggered it?
Update: Restarted my Mac (just restarting iTunes didn't do it) and now the miniplayer remembers where I put it. Odd. But, at least, now it's better. I suspect somehow it got its prefs file locked up while I ws playing around with settings and couldn't write the window position of the miniplayer to disk.