Free Rapid is one of my favourite's, which is freeware (website link). You can paste in a list of URLs (e.g. for a multi-gigabyte series of RAR files), let it run overnight and usually it's complete by the morning or after returning home from work the next day.
It also works on a variety of other file sharing services such as MegaUpload, DepositFiles, etc.
While it does not get around the restrictions (e.g. 30 minute wait between downloads), it automates the process, does the waiting, capcha, etc. in the background and shows the progress meter in its user interface.