I don't have a huge variety of airport experience, but after about 40 trips in the last three years it's an efficient security I value most.

In Brussels Airport there's a single security hall with a huge amount of lanes that are opened depending on demand. I've never had to wait more than a few minutes. You go to a "filling station" where the very large trays are automatically fed to the lower part of the station. Three people can put their things in trays in parallel. There's no operator at the machine, the images are checked centrally, and automatically pushed to the side when flagged. It's easy, modern and just completely frustration free.

The rest of the Brussels Airport experience is a little different depending on which gates you're at (Schengen or non-Schengen) but still usually quite good in my opinion.