I've ridden the same Brooks B-17-clone Fujita Belt saddle that came on my S-10S for well over 45,000 miles. I never had padded cycling shorts in all that time. Now I do - but only wear them if riding more than 50 miles (approx three hours) at a time. For my 10 or 12 mile one-way commute - nope.
Oh, don't get me wrong, it originally took several hundred miles spread over a few weeks for the saddle and my butt to come to a mutual understanding. It also takes a week or so every Spring. After that, it really doesn't bother me.
Now I'm faced with the task of replacing the cheap SSO (SEAT-shaped objects) on my latest acquisitions. Since my butt is already broken in to my Fuji's hard leather saddle, I suppose it only makes sense to get the same style for the other two so they fit/feel similar.
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time