I'm happy to say I've never used IE as my main browser in over 12 years of internet use. I started with Netscape - v2 probably - went to v7 with a touch of Opera on the way, but didn't like Opera ads. Now I've setled on FF with some extensions.
Same thing with mail - never used any flavour of Outlook. Now on Thunderbird, also with some extensions.
I do like Opera's image on/off switching though. The closest FF has come is ImagePref, but that isn't 100% with frames, and is tucked away on the status bar.
No other gripes at all.