[Osiris]

Or do they really like the gimmicky extras that Opera offers that much?

This. I started using Opera long before Chrome even existed. A basic thing: Hold the right-mouse button and click the left. It takes you back to the previous page. Chrome still doesn't do that.

It's the UI that I prefer, not the rendering engine.

The major reason that I use Opera is the built-in mail client. I have half a dozen email accounts and using multi-account login in Gmail is a bit of a pain. Having the email client built into the browser checks all my accounts for me (using IMAP) so I have one "Unread" tab open instead of 6 Gmail tabs.

[Tomek_]

Exactly. I'm trying to use other browsers too and stuff like these, like the way how ctrl+tab works, or, especially!!!, tabs thumbnails (seriously, this is the best thing ever) are keeping me coming back to Opera

[MertsA]

Uhh, maybe you should try that in Chrome. The very first item on the drop down menu that comes up is the back button and no you don't need to release right click to click on it. Also, it's even faster than Opera, you can just right click and then release it over back and not have to left click at all.

[mcintyre1994]

It's not using 'back'. It's a 'rocker' gesture to navigate between tabs. Right click anywhere, then left click while holding it, move to the left tab. And vice versa.

[tripzilch]

I may be confused what you're referring to, but switching between tabs is right click + scroll wheel.