If you need to find what is the biggest folders in current path in linux then this is the command:

du -sh * 2>/dev/null | sort -h

It needs couple of seconds to calculate (if you have slow io vps or hdd) and this is what you get:

root@vps3345:/home/nick/web# du -sh * 2>/dev/null | sort -h
713M    alle.ch
1.1G    moji.com
1.6G    rab.de
1.8G    zoek.nl
2.5G    al.at
5.4G    mojia.si
7.6G    a.co.uk
11G     sle.cz
13G     akceer.com