I don't use UV (protection) filters on my 40/2.8 pancake or on my EF-M lenses, but I do on the all the others that take them.
Crap, that technically should change my vote. I am answer #1 above, but the pancake is an exception.
Should change mine as well (I voted as close to the actual as I could). I have the same exceptions as Neuro, plus my TSE 24 (version 1) and my Rokinon 14mm. Haven't yet figured out filters for those. And sometimes it's too much work to replace the clear if I am swapping my CPL on and off lenses doing landscape shots.
Ah that's right, I forgot about my Samyang 14mm. No filter possible
Again: Don't change your votes if your exception-to-the-rule lens doesn't allow direct front filter use without the use of added adapter / outrigger hardware.
So UWA lenses like the Nikon 14-24, Samyang 14mm, T/S-E 17mm, Fisheye, etc. should be dropped from your mind when you answer. Same goes for lenses you only use with square / 4x4 / 4x6 filters.
I am asking in this poll: when you are using a lens that could take a UV/Haze/Clear or CPL directly on the front of the lens, do you?
I called out the pancake as my one exception as it indeed does take front filters but I simply don't care enough to protect that little guy. Any time I need CPL use, I just switch to a 28 or 50 prime.