Disneymoon04 - We often go to WDW in the cooler weather, so we also don't look forward to walking around soaked. We wear ponchos on Splash Mountain, and usually emerge in a somewhat damp, but manageable state (especially if you avoid the front seat). The main problem is that sometimes the seat you're about to sit in has a large puddle on it already.
Traditionally we save Kali for the last half hour AK is open. At that time we've always been able to ride 4 or 5 times in succession without having to leave the ride. Even if you wear a poncho, after 4 or 5 rides you are absolutely, positively, jumped-in-a-pool-with-all-your-clothes-on wet. At that point we discard our T-shirts and pull on dry sweatshirts to leave the park. However, if we were headed anywhere other than our hotel, we'd take along a complete change of clothes.