If I want to send a print out or PDF version of a Mathematica notebook to a colleague who doesn't have Mathematica and has no experience with Mathematica, then I would select all input cells and convert them to TraditionalForm (using cmd-shift-T on a Mac) prior to printing or saving as PDF.
I have my notebook interface set so that input cells use StandardForm and output cells use TraditionForm. I prefer this since I don't need to remember special key combinations to enter stuff into input cells with StandardForm like I would with TraditionalForm. And I get output I find more readable without the problems a wrapper causes which occurs when you explicitly do
which would display the polynomial in traditional form and the plot as well. By setting my default preferences to have output cell display in TraditionalForm that is exactly what I get when I type f[x] without using the //TraditionalForm postfix notation explicitly.