We just killed what will be our final two seater stroller recently. My boys together weigh 90+ pounds and I just can't justify spending several hundred dollars for a stroller when they are now 5 (45 pounds) and 3 (48 pounds - don't ask me lol he isn't fat at all, just thicker somehow than his brother) and can walk most places. BUt, I do believe that overly tired children make a WDW trip a nightmare, so next time, we are probably going to rent a double stroller on the days we go to the bigger parks.
Pushing that much poundage in children around all day can poop out a parent too