Yes, worth it. There are performers on the boardwalk near the Flying Fish to the Screen door. There are also carnival type game booths (basketball shoot, etc). And there are food stands spread through out.
Plus you can watch the Epcot fireworks there. There's also the bike rentals there. Lots of people eat outside the pizza, bakery, ice cream stores if the weather's nice.
I've never been to Jellyrolls, but DH did when he was younger. There's also a dueling piano bar across from Jellyrolls.