I drive mine on and off. I have another car that I drive during bad weather, but if it's raining and I happen to be out in the M3 or going out for something a bit special I won't get bent out of shape. A little rain doesn't hurt. Snow is a different story, but depends on what kind of snow. I'm too cheap to get a winter setup, but it doesn't snow enough here to really be necessary.
My biggest thing is putting the seat all the way back when I get in and out... Trying to save that bolster from wearing...
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel