Indeed, it can be dangerous used at the root of a disk (like it is currently in Windows).
But it is very useful when you have a lot of files to assign to several subfolders.
For example, consider you have 10 year foldders, each one with 12 month subfolders, each month including a "me" and "others" subfolders. (And on the right panel, xxx pictures to dispatch). Without *, you need to click 130 times on all the + to have all the folders displaying on the left panel.
I don't know if it could interest other people.
On my side, this is the only missing feature preventing me to become a MC user.
Thanks.