To counter TrueBlue, I don't like allocated seating
When flying with hand luggage only and in a reasonable level of fitness, being one of the first to disembark means one can run ahead to immigration where there is usually little or no queue by virtue of all other easyjet passengers dawdling through airport corridors, flash one's EU passport before being waved through, and leave the airport terminal quickly, jumping on a bus / train / taxi to the town
Previously I could almost always turn up late at the gate without having to spend 30 mins standing in the boarding queue, and still get a seat fairly near the front of the aircraft. Now I have to pay extra for that.