Do strollers need to be folded when riding a ferry across World Showcase Lagoon at Epcot?
Unless it is really crowded you can push a stroller on the Friendships without folding it up. You will usually need to take your child out of it to take a seat, however, as the strollers are parked near the back of the boat en masse. If you’re able to get a seat in the last row or on the outside of the boat you can watch your kid, but no guarantees that those will be available, and priority is given to wheelchairs and ECVs.
We always rent a disney park stroller, which is hard plastic and doesn’t fold, and we just roll that right onto the boat no problem.