They've been in place at Boston's Logan airport for a while, but today was the first time I went through one of the new and semi-controversial full-body scanners. I tried not to think about what the security folks were looking at, and it wasn't too bad. It did seem to take a lot longer than the regular X-ray does, and I ended up getting a very thorough pat-down anyway, though. I was traveling during a slow time at a slow gate, but if this was how they were checking people at 6:30 am in a busy terminal, I can only imagine how far the lines would have backed up.
Thankfully, the rest of my trip to Baltimore was much less revealing.