We used EasyJet from LDN Gatwick to Athens recently and found the whole trip to be quick, easy and problem free.
As with any low cost airlines if you are expecting to get top hand held service then you've got another thing coming. Only carrying hand luggage we were straight through security at the airport and to the departures lounge. We have purchased speedy boarding as we like to choose our seats to be closer to the front of the plane as my girlfriend prefers it for flying to be away from the wings.
The speedy boarding arrangement at Gatwick was a bit rubbish if I'm honest. It was the only part of EasyJets service both ways that let them down. We were on the 1st flight out so the plane was there ready to go and all good. On the plane all was as expected, not tonnes of leg room, attentive staff and quick service.
The return journey was better organised and speedy boarders got what they had paid for a prioritised service. The one thing that really sets EasyJet apart from the likes of the other blue badged Irish version is the fact that you get an overhead bag on the plane and do not have to pay an extra £6 for it to stay with you.
Will always recommend EasyJet!