USB? Appeared on PC motherboards well before Apple ones(it was Intel's baby after all), Apple was just the first to burn the legacy options.
USB was an obscure curiosity when Apple aggressively adopted it in the original Bondi blue iMac. I clearly remember watching the market for USB peripherals be completely driven by demand from iMac (and then other Apple model) owners at a time when PC users stayed away from the technology because it was incompatible with all their PS2, serial and parallel port peripherals. Often the place to find USB equipment was in the Apple section in stores.
802.11b? All of Apple's 1st gen gear was rebadged Lucent off-the shelf stuff.
This one I remember very well. Apple spearheaded the consumer wireless market with the introduction of the $299 Airport "UFO" wireless hub. I had wanted wireless for a while but couldn't afford it. The only other options were all so far above that first Airport price point that it was a shock to the market. The other thing Apple did to lead in consumer wireless was to make it an option in all their computers, especially in laptops, and then a standard option that you had to de-select and finally as an unremovable feature.
Killed off the floppy? The first to stop offering it across the board, possibly; but you've been able to spec PCs without floppies well back into Apple's beige era.
Maybe so, but no sane PC user did back in those days. The floppy ruled the PC data storage and transfer world well past the point when Apple users had moved on to other technologies. It took forever for PC USB boot support to be common enough to supplant the ubiquitous PC admin's emergency boot floppy.
Everything you have said is technically true but misses the whole story. Sure, Apple didn't invent the technologies you mention but Apple's influence was instrumental in getting early adoption going and building markets for them.