My kids were 3 (b-day trip), 9 months and 10 months on their first trips and the only regret I have is that I didn't take my oldest sooner. I loved watching my babies enjoy Disney and wish I had that with my oldest. But, we couldn't afford it and thought we'd wait till she could appreciate it, be potty trained, all that stuff. YES, 13 years later she still remembers her first trip and her sisters don't, but still, it was fun to take them as babies.
But my answer, YES, take them. They are at great ages!!!