Yes, I did a digital clock, too, my first digital design/build. It never did work right.

I've never heard anyone say that

As a British person who learned Swedish -- which also uses that convention -- around the age of 10, I often found myself a little uncertain when hearing "half six" in English, as I grew up with the more explicit "half past six".

i'll let you work out whether those are "viertel nach fünf" (quarter past five) or "viertel vor sechs" (quarter to six), or "viertel nach sechs" (quarter past six), or "viertel vor sieben" (quarter two seven)

It feels easier and more natural to round to the nearest 5 or 15 minutes with an analog clock than a digital clock. But I grew up in a time when analog clocks were the norm and digital clocks and watches were an expensive novelty (or used for special purpose clocks) so I became used to analog clocks (and use an analog display on my watch, even though I could just as easily set it to a digital display).

When I do use a digital clock, I generally read the time that's displayed, I don't mentally round to the nearest 5 or 15 minutes, only with an analog clock.