I have taken my DD ( who turns five today - an April Fool's Baby) by myself to WDW twice. We enjoy WDW much more than DH! So he took a Vegas trip- We took a WDW trip
Both times we had a great time. We we able to focus on the rides she wanted to go on, saw a ton of characters and watched all the parades.
However it was a little hard in the airport going through security, handling all the bags by yourself and having to take all your bags to the bathroom when you had to go
I would not hesistate to do it again. However my DS is due 4/22/05. So it will be a while before DD and I take a trip again!
Have a fun time!