Then IE4 came out and kind of... won. I never really liked IE much, but well you know the whole default installation story, and I'll bet most Mac users use Safari.
Thats completely different - many Safari users (including myself) have tried alternatives for a good amount of time and decided they prefer Safari. The same cannot be said of IE on Windows as almost no one switches from FF to IE.
Although I must have used Netscape, I have no memory of it, and horrible loading times of Yahoo! games is my main memory of the 'olden days'.
I switched to FF as I had a big problem with IE that I couldn't solve (it would show backgrounds as white, which was especially dreadful on Bungie.net which I couldn't navigate). I didn't want to reinstall Windows again, so I downloaded FF and within a week I switched my entire family.