22:00 is quite a good time to get in though, there is a bit of a lull in international arrivals between about 20:00-22:00. The crunch comes from about 22:45 when quite a few FR flights have offloaded and it gets worse until about midnight. LGW isn't much better though and LTN is about the same in my experience.
I agree security has been an improvement the last couple of times I've passed through