Just out of curiosity, if I removed Explorer today, how likely would it be that tomorrow I would be saying "Dang, this particular function (nothing specific in mind so far) used to be so much easier with Explorer?"
Its a virtual certainty, if only because we all get VERY accustomed to the particular interface of our main browser, and any other, even if its better, is going to present a re-learning experience.
Nature of the beast.