I was unaware that Libraries is now Windows Explorer. That's what it looks like, anyway.
I was looking all over Start Menu for Windows Explorer, and couldn't find it. And everytime I would have use of WE/Libs in the Taskbar, it was always because some other program I had opened sat there.
I just now ran the pointer over it, and of course it said Windows Explorer. Yeah, I'll definitely keep WE/Libs active, now.