I take issue with this too. Apple is often ahead of the curve but I don't think they are responsible for making things like the GUI and USB more popular. Things like this would be adopted anyway, Apple just happens to be first because they have a smaller set of customers to aim at and position themselves as a premium experience.
That's a revisionist cop-out, though. Apple isn't always at the front, but the USB example in particular is a poor one. They were widely criticized at the time for putting all their eggs in USB's basket.
With perfect hindsight, it seems like a risk-free move, but it certainly wasn't at the time. For everyone who praised the decision as bold and forward-thinking, there were two who predicted that it would cause Apple's final collapse into oblivion.
The iMac having only USB didn't spring forth all the USB accessories, the technology was already well entrenched in PCs.
It certainly was
not. Linux support was a mess through the early 2000s, and Windows
first added USB support in September
1997, less than a year before the iMac. In 2001, most printers and scanners for PCs were still based on parallel ports. There are still a large number of PCs using PS/2 keyboards and/or mice. The first computers with USB keyboard support in BIOS didn't appear until 1999 and it
still isn't universal.
The iMac, also launched in 1998, not only included USB, but didn't include anything else. It was widely panned for doing so by most enthusiasts because at the time there were no significant practical advantages to USB and there were almost no peripherals available to use it. Most computers didn't have it at all, and those that did had purchased aftermarket PCI cards to get it. The peripheral selection was that of the early adopter crowd.
There were no flash drives or digital cameras or external hard drives or media players or much of anything, really.
Heck, MP3 players were already on the way up
The first commercially successful MP3 player, the PMP300, didn't exist until after the iMac. It didn't use a USB port, but instead a parallel port. The famous Nomad, released in 2000, also used a parallel port. It was the Nomad II that used USB.
I do agree some people here will tell you Apple created MP3 players and USB out of thin air, and others that are more tame will just claim Apple is sole responsible for their adoption.
They neither created USB nor are solely responsible for its adoption, but to dismiss the huge role Apple played in both the implementation and the popularization of USB is foolhardy at best.
Some of the other things popularly attributed to Apple are overblown, but USB is not one of them.