Not for headlines, but within copy, it is important for me to use the word LIKE somewhere in there for two reasons. The first is such usage almost always is in an analogy, and anologies work well in persuasive writing. Analogies are like pictures, they convey more than the words they are comprised of. The second is that within the analogy, I always try and put the word like in front of what I am persuading about. For example, if the new “what-a-car-mobile” is something I am trying to pursuade some to take interest in, I could say “Seeing a double rainbow is for visual pleasure much like the what-a-car-mobile is for driving pleasure. The embedded secondary statement that speaks to the subconscious is ‘like the what-a-car-mobile”.