What an enthusiastic post!
I feel similarly, except generally my preference is for software that's a bit newer, at least new enough to be on CD. Those Pentium I - III era games were great, and if I could play through one per week, there'd be enough to last a lifetime. Seems like so many games today are either copies of each other, or copies of those older graphical games.
And I keep a Windows 98 PIII set up just for the purpose of 'playing' with older software and operating systems: BeOS, various Windows versions, QNX...
Even on my new computer I still run Office 2000 exclusively for an office suite. That version was just about perfect - logically laid out, smooth and reponsive, and stable.
No interest in non-game software? Hardly.
Would you believe that the science software we use each day at work dates to 1998-1999? Our drafting software is Autocad 2000. And, until last week anyway, Office 2000 was installed on each computer. There's just not much motivation to 'upgrade' when the old stuff works just fine, and the new stuff costs thousands of dollars.
Personally, I'm especially interested in old CAD programs, old science software, and old office programs. Unfortunately, that stuff almost never shows up at garage sales.
While not necessarily "vintage" by strict definition, the half-decade from 1995 to 2000 was certainly the "golden age" of modern home computing.