Photoshop as a crutch.
Photography purists will tell you that while Photoshop may be handy in slightly tweaking photographs, it is in no way a replacement for good composition and thoughtful photography. I tend to agree, but only to a point. I say, if Photoshop isn't supposed to be a crutch, then why'd they make it work so much like a crutch? Face it, photog elitists. Your glory day in the hot sun is over. If you want to remain relevant, then do something we can't do with a little software knowhow. It is possible to do good photog work still. Just stop griping about how camera raw makes it too easy.
(Sorry. I didn't mean to make this sound so harsh. It's basically my justification for tweaking the crap out of my photos without feeling guilty about it.)