yes, i've encountered similar questions many times, about many things. sometimes they are the remarks of evangelists of another competing software (e.g. vim versus emacs), other times they are honest and curious questions.

i personally cannot use a font that size. regardless of how much more i can see. if that was the issue i'd run vim full screen in a distraction free mode. but i like a little style mixed in with my functionality. and for my eyes sake i use gohu size=11.

but if it works for you, go for it! who cares what other people think!