There used to be a means on the easyJet website to get fares to all destinations from an airport for dates of your choice. E.g. I tell it I want to go away from Jan 1 to Jan 8 starting from Gatwick, and it shows me the fares to every destination. It was always hard to find, but now I think it's disappeared altogether. That's quite a loss if it has.
you can do it on various other websites put in everywhere and you can even narrow it down to the particular airline if you prefer one over another. Never seen it on the ezy website though but a great little tool.