Hi Amy!
There are lots of things your twin boys can enjoy! You will find that there's so much to entertain small children. Form exciting shows like Playhouse Disney - Live on Stage at Hollywood Studios to character Meet n' Greets, they will definitely enjoy WDW.
Your boys can ride any attraction that doesn't have a height requirement. If you want to enjoy attractions that they can't ride, you might want to take advantage of the
Rider Swap option, so you can take turns with another adult waiting and you don't have to stand in line twice. For more information about traveling with small children, check out the
Traveling with Little Ones section of the WDW website. On the right side of the page you will find a list of attractions that have height requirements, so you will know which ones to avoid.
When we travel with babies to WDW, there are two things that make the trip a smooth one: naps and snacks! My kids have no problem taking naps in their strollers but sometimes we go back to the resort for naps. Well rested children make for great travel companions! The snacks and water bottles are always handy because with so much going on, meal time can be a little later than expected. So snacks keep the kids happy until we get to our chosen restaurant.
Hope this helps and have a magical vacation!