[Xolvix]

I think it's worth giving drive letters some credit. It makes it very easy to mentally designate a drive, whereas people can get confused about the concept of UNIX-style mount points since people don't mentally distinguish between a regular directory and a mount point (they'll look both the same).

Also Windows has had the ability to mount a drive at an arbitrary location for a while now (so not just a drive letter), but as far as I'm aware it requires the command line to do so.