I don't remember if Plug-n-Play shipped with the original Windows 95 (it's certainly there in the final OSR), but that was a pretty big shift from the manual IRQ and port mapping days of DOS/Windows 3.1.
back then, it was still plug-n-pray. it didn't work as well as it was intended when it was first available
It did. That was one of its big features.
It also was the first version to remove the 8.3 limitation and give us long file names.