The main terminal extension has not even opened yet. That has still to come along with a significant increase to the number of stands. Work is in progress but these things do not happen overnight. Having said that. I think the place will be a continuous building site for the next ten or so years as they struggle to match capacity to demand. Its great that proper investment is now going in though but the current projects wont solve all of the problems.
I have definitely used worse airports though, a few of which are also in the UK.