I LOVE to ride in the rain. I could be weird, but I've found myself sitting in my office looking out the window at the rain, wishing I was out there. I've even been disappointed when the rain has cleared up in time for my ride home.
I always carry raingear in my backpack, though it happens that I just keep riding. Living in Houston it's humid enough at this time of year it doesn't really make much difference whether you get wet from sweat or rain.
Sverre