We are going to WDW in May 2018, our daughters will be 5 (will just turn 5 on the trip) and 2 (just about 3). We will definitely need a double stroller, our oldest always gets into the stroller after a day at the zoo. We are staying at AOA and will be flying. We have a double BOB stroller (side by side) but are considering renting a City Mini Double so we don't have to fly with the stroller. Are the double strollers difficult when on the buses?