My first ride in a downpour was in '02, in winter here in Austin (so it wasn't really THAT cold). I remember being soaked to the bone, but most of all I remember SMILING and LAUGHING to myself the whole time. The experience really made me feel free, honestly. When we drive we are so disconnected from the seasons and weather.
I'm sure the drivers thought I was absolutely nuts... of course, they were right! To this day, I really don't bring any raingear with me, except for very rare occasions. Having replacement clothes at work helps, though.