Just curious: why is font-size such an issue?

I mean, I like my size how I like it - and adjust it all the time ( cntl/cmd -/+ keys) as I move from site to site or use windows of different sizes. [And have even set a hot-key combo to toggle on/off Safari's "Zoom text only" feature.]

I've been told that only the geekiest 1% of population are even aware of the possibility of text zoom, but for us... doesn't anybody else tweak on the fly all the time?