I'll give you the other opinion. Our last trip our youngest was just under 3. My DH is very anti-stroller and we didn't even still have one around anymore to take. He carried DS when he got tired but said it was worth it not to lug the thing on and off the buses, find it outside attractions, etc. We rented one for one day when DS was really not feeling well (and I was the one who did that since I sent DH off with our girls to have some fun). It was nice to be able to walk around the parks without steering a stroller through the crowds, stores, restaurants, etc. I would try without one and if it gets too bad you can rent one or buy the umbrellas they carry throughout Disney. Personally, I wouldn't buy one special to bring.