To add my tuppence - I went through T5 yesterday for the first time. I didn't find any issue with it - I found it a good place to travel from. It was relatively quiet for evening rush hour, able to walk about without feeling like a battle's being fought. Only gripe perhaps would be to include a sign immediately at the bottom of the escalator from security telling people which way to go for the gates. But I enjoyed the experience and didn't have have any problems with it!