I like many browsers, I prefer to influence people to support many different browsers and thus support choice and innovation.
I use Opera 10.10, Firefox 3.7, Firefox 3.5.3, Chromium 4.0.221.7 (specifically the Ubuntu build 28103 which is faster than Chrome

), Chrome 4.x, Midori, Epiphany, Seamonkey and konqueror.
Some browsers I only use for specific tasks - but Opera keeps my feeds, and is good for searching (easier to manage search options there) and I like the new tabs. Firefox can do pretty much the same - with tabs as thumbs in sidebar - but I prefer Opera for mail and feeds.
Opera takes some configuring, not as much as Firefox I guess - but I don't mind this.
Chromium is probably the most user friendly as long as you don't need to do much. Opera is the most user friendly if you want to do a lot. Firefox is the most user friendly if you want to do just about anything...
The main thing I dislike about Opera is that it cannot go open source - this is why Firefox is adopted on Linux desktops (sometimes just as an unbadged version, like Iceweasel in Debian)
The main thing I don't dislike - but in some ways it makes for problems - with Firefox, the amount of reliance on Add-ons does often undermine it as a browser... especially if you use Windows (to update your system with Microsoft puts everything at risk).