I'm with Tiff, I have a large collection of pans because I love to cook and different pans are good for different things.
My work-horse is my 12" stainless fry pan but I also have a nonstick in that size.
I have a wok, and I also have a braising pan (sloped sides, domed lid) that doubles as a kadhai or lower, short-handled wok. Both of these are stainless finish.
I have 10" and 8" stainless fry pans that I use for things like roasting spices, when I don't need the larger pan. I probably do not need both of these. My 8" nonstick, however, is the perfect size for cooking and flipping two fried eggs and I use it for that nearly every weekend.
I recently got a 12" cast iron pan - that is a lot of fun, a very new toy, not something I've worked with before but I know people who swear by it. If I get to like it, it might take over a lot of the duties that my 12" fry pan and braising pan do now.
Oh, and I have a 16" nonstick pan as well for very large jobs. I like this when I am sauteeing up fish and want to have lots of leftovers for the week.
I use all of these pans, except the smaller stainless pans, very often.
That's just my pans.

Pots, dutch ovens, tagines, roasting pans - all a subject for another post.