I miss changing tabs (from any other tab) by right-click mouse wheeling.
I miss "Insert Personal" and "Insert Note"
I miss having a separate tab for Downloads, instead of the default Chrome bottom thing.
I miss being able to move around ANY button (and add or remove ANY button) and ANY Navigation Bar.
I miss Toggling the Panel and being able to do anything involving it.
I miss right clicking and being able to Block Content, Inspect Element, and Edit [individual] Site Preferences.

Speed Dial really isn't the same.
Settings isn't the same at all!
No more Forms, no more changing EVERY SINGLE search engine, no more any of that.
The "new" popup blocker sucks compared to the one in Presto (because it actually blocked popups and didn't allow only "approved" ones). I also can't get out of middle click browsing by scrolling, it has to be another middle click or left click (I used that a lot).
No more Tab Stacking.
No more Tab Scrolling.
No more 64-bit support.
No more integeated Opera Mail.
No more Opera Unite.
No more RSS.
No more custom spelling dictionaries.
No more “Open in Background Tab” option.
No more Built-in BitTorrent client.

The list goes on
http://operabrowser.wikispaces.com/Features

I hate using Blink/WebKit. If I wanted to use it, I'd just use Chrome. It's pointless to use Opera now. I was always excited to get updated to Presto Opera. It's like the Devs gave up and wanted to just follow Chrome down the easy road.

Thanks for the watered down CrOpera.