By the same token, the method of storytelling is also completely different because you don't have narration (or if you do, it's considerably less than it is in prose -- unless you're Don McGregor in the 1970s, anyhow...
), and you do have visuals.
The use of narration, whether by an omniscient narrator or by a character in internal monologue, seems to be less common in comics that it used to be. Heck, back in the '30s and early '40s, pretty much every panel was described with a narrative caption even when it didn't need to be. And Stan Lee's comics were loaded with his distinctive, lively, fourth-wall-breaking narration, a style that Marvel (and to some extent DC) followed for decades.
And is it my imagination, or are thought balloons becoming less common too?