Here are 2 tools developped to improve our workflow... Depending on how many people could find those useful, I might think of a public version in a near future.
It was developed in windows, for windows and as it it quite heavy file manipulation I think it'll hardly be rewritable for macs. Despite this, proxies should be usable on macs too.
Little python workflow plugin to generate file proxies. It has some constraints and limitations, but save looots of time for mass "proxying". I mainly use it for huge scenes, to reduces the file size.