I've been mounting 28-30mm decent quality tires on my bikes for years, as I've found them to be a good compromise between look and feel on the kind of bikes I ride and for my rather leisurely riding style on anything from smooth tarmac to the strade bianche.
However, when I decided to give 650B wheels a try, one thing led to another and I ended up with a gaspipe frame on cheap nylon 650 x 40B "demi-ballons" made in Vietnam. And I love how the whole thing feels.
At around the same time I had a pair of lovely smooth 30mm Honjo fenders and some nice but narrow Vittoria tires (no width specified, but I measure 24mm) and I decided to combine those with one of my favorite framesets. Added some nice parts and ended up with another bike that I love to ride. Where the bike above is more akin to a well-sorted SUV, this is a sharp-handling sports car.
So now neither of my two current favorite bikes rides on what I would have called my favorite tire width.