I love the rain when we're in WDW...
I really do. And my kids and DW have developed the same "when delivered lemons, chug-a-lug the lemonade" philosophy!!! When it rains, the crowds are less, the line move quicker, and admit it... its just cool to walk around in the rain like it doesn't matter.
In fact, I think it epitomizes the freedom we feel on vacation when we slosh around in the rain, still doing all the things we wish!!! Carpe diem... indeed!
Relax, and enjoy the magic you're presented with... the keeps you cool, and keeps the crowds thin.