You are correct. At newspapers (I write for one) they're called copy editors. they edit the copy and write the headlines and subheads. They're given a certain amount of space for the headline to give the main point of the article. And it has to draw attention. It's challenging.
In J-school, editing was one of those things I did extremely well. I still have a printout in one my storage bins of the first front page I designed, edited and so forth. Yeah, I'm a nerd. Hammers, kickers and second decks oh my.
Headlines are HARD to write. You need to have an intimate knowledge of your target market. The biggest mistake I see with headlines (not that I'm a copywriter...) is that they contain too many benefits. Don't sell them in the headline - just make them read the first line Dave