Since you are not travelling with young children I would say definitely get hoppers if they're in your budget. $110 is not a small chunk of change, but when compared to the total cost of your trip may be pretty small. As others have said hopping is easy. It gives you more choices of rides, food, and entertainment. Also many people feel that DCA can be seen in a day or day and a half whereas
Disneyland needs 2+ days. If you go with non hoppers you have to choose between 2 days at each park or limit yourself to just one day at DCA. DCA has a large amount of rides that are not found at WDW. We personally love DCA and would be sad to only have one full day there. And if RSR went down that day you could miss it and it is truly a must do.