After so many years, I'm leaving too (I'll give FF a try).
It's really frustrating to see how opera managed to change so much to become just a bad copy of chromium. It's appalling how so many good features were discarded, and how obvious the change in the target market has been: like you didn't care at all about old affectionate users.
I've been using OperaNext as a "sidekick" to opera ever since it came out, as it took chrome place of browsing those websites which opera couldn't handle, but I wouldn't believe the official Opera would stick with that meagre feature set that was implemented in Next.
I stand by this message as a statement of my own: http://my.opera.com/community/forums/topic.dml?id=1709012
I miss all of the features there listed, and more (what about password synchronization, notes synchronization, dot shortcut for inline search.. )
I'm really sad