I usually book everything myself, but at times I've used travel agents. When I went to Japan, for instance. I was traveling with four others, and I booked our tickets through an agent specializing in Sweden to Japan travel.
The rest of our group, about 20 others, found tickets online, which, as they were unrestricted Y, cost quite a bit more than the average 1000-1200 USD for online restricted Y fares. They paid around 1600 USD (in 2005 currency rates) for SK and OS flying CPH-VIE-NRT and back. Me and my four mates paid 1200 USD for unrestricted ticktes on SK and KE, flying CPH-LHR-ICN-NGO-ICN-FRA-CPH, which was much closer to where we were headed in Japan anyway. Also, we could change the departure point on the return trip for about 20 USD, and changing the dates was free of charge.
So that was a pretty good deal, and the KE744 to ICN, as well as the KE773 to NGO was a helluva lot more fun than an OS A340 to NRT.
Mostly though, I find that travel agents usually are more expensive, at least when I'm looking to travel. But on the other hand they have more access and more experience in finding cheap fares than the average traveller.
Sure, we're concerned for our lives. Just not as concerned as saving 9 bucks on a roundtrip to Ft. Myers.