I think songwriters look at titles, I don't think the average listener gives a damn. But I suppose for filing purposes, it's easy to locate a unique title.

Not sure commercial music is worrying about that though. Today there are a lot of one word titled songs, sometimes the title doesn't even appear in it, so the jury's out. Apparently it helps in twitter and facebook to have one word titles.

"Grenade" "Royals" "Stronger" "Down" "Low"

Big hits with unimaginative titles, but they don't take up a lot of space!