Hi Lee Ann!
I have traveled to Disney with a 7 month old, a 9 month old, a 1 year old and a 3 year old! Don't worry, it wasn't all at once! :)
Just a few things that come to mind:
-Bring a stroller, sling or whatever your little one will fall asleep in! My son did not fall asleep in the stroller and it was NOT fun!
-Keep naptimes if you can! You can literally go back to the hotel for a nap. Or visit the Baby Care Center for some downtime (there are private nursing rooms, changing tables and even a TV and books!) You could even make a restaurant reservation during this time or visit a dark, cool attraction (like Hall of Presidents or Carousel of Progress)!
-You won't really miss any shows or attractions (except for the big scary stuff!) because the kids will love all the lights, music and color. My kids loved the parades, shows like Festival of the Lion King and the bright attractions like Small World.
Don't forget to visit
Traveling With Little Ones has some in-depth tips and even a downloadable map that's highlights the attractions for little kids.
Hope that helps!