That is a GFCI outlet (not a switch) and is actually out of the wet area (although by the sink). I'm not sure about GFCI protected switches but there are combos with a switch and a GFCI outlet in one. You may be able to protect the switch with a GFCI outlet up the line somehow. Please do consult with a licensed electrician, though!!

Sound advice @6. No switches should be anywhere near the shower's wet zone. A distance of 3' or one meter is required here in Canada but with the over spray a distance of 4.5'-5' would be safer.

Bathroom GFI's and Floor Heating GFI's should all be checked on a regular basis.

John Whipple
By Any Design Ltd.
http://www.No-Curb.com

NEC code requires an outlet near the bathroom sink. You can put light switches in the shower if they are part of a UL rated shower assembly. But I have the same question. I am wiring a 4'x10 walk in shower area and I plan to put a shower curtain 3' in so 4'x7' wet area and 4'x3' area outside the curtain for towels and clothes hooks. It seems OK by letter of the code for me to put timer switches for light, fan, and heater in the "dry" area outside the curtain even though it could become wet if the curtain isn't closed like any other shower or tub. Interesting the 6' handheld shower hose could reach within 1' of the switch. The handheld shower in my existing smaller bath can touch the switches and outlet and even go out the bathroom door into the hallway.