> I was wondering if anyone uses ACLs? I can't understand why they are
> necessary since regular file permissions seem to do the same thing

Others have already replied. But let me give you a simple example we
actually use here:

Users in group A should have read and write access to a directory.
Users in group B shoul only have read (incl search) access to it.
Users not in either group should have no access.

I'm sure you realise you need a few more bits than the regular file
permissions provide to do this.

> Is it safe to say that ACL's
> are not very popular?

That is probably true. But they ARE used.

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