In 1999 we had a very soggy, hot and humid 17 day trip. The first part was so hot and humid we were praying for rain, well we got it!!! The second half of our trip it felt like it was raining non-stop. Most days was fine, just put on the waterproof sandles and ponchos and away we went. But on some days it was a cold, and windy rain and we froze out butts off, ended up getting sick for a last few days in WDW.
However I will say the parks we dead when it rained!!! At MGM almost everything was a walk-on. The only thing we missed was Fantasmic!! At IOA/USF the parks we so dead it felt like we were the only ones there. I have video of our car being the only one in the lot and this was at about 10am.
That was a odd weather trip tho, right between two hurricanes. We had a blast though and would do it again in a heart beat!!!
Now for some suggestions, get watershoes or waterproof sandles, they dry super fast and you won't get the blisters you would from wet socks and sneaks. Pack light jackets if the temps call for cool weather, with rain. For the stroller get an adult sized poncho and put it over the top it will keep your daughter dry unless you are heading into the rain, worked great for our little one last year. Take large ziplocks for cameras and such so they don't get wet if it's raining. And just go with the flow!!! FL weather can change in a sec, you just have to remember you're on vacation and have a blast even if it does rain!!! Most rides are inside and the queues are mostly covered, so it gives you a chance to get out of the rain.
I do tend to hope for rain when in WDW, sounds weird, but it does keep some people out of the parks or sitting in restaurants, so that keeps the lines down, typically and that means more fun for us!
Have a great trip!!
Pammy