I've been riding motorbikes on the road since the 1970s and still ride one as as leisure activity (might go out on mine today when the fog clears).
Thirty years ago I used one to commute to work, albeit on a reasonably open route, in all weathers except snow. But these days (and a few jobs down the line) there is far more traffic about, most of it being far larger vehicles travelling at much higher speeds. Although I would have no problems parking at work, my daily commute is almost one hundred miles, with most of it necessarily on an extremely busy motorway. No way would I do it on a 'bike because it just wouldn't be practical or safe enough, imho. Also, I wouldn't want to leave my bike outside in a public car park for a few days while I'm away working.