You haven't had to update 1 file at a time since we launched our new site. You can select what plugins, modules, etc.. you want on our downloads page below using the checkboxes. Then at the bottom of the page click Download Package. This will download and install all of the selected plugins, modules, etc..
www.joomlapolis.com/downloads
You can then redownload exactly what you just selected except with latest releases from your download history below (also available on your profile).
www.joomlapolis.com/downloads/download-history
We also now provide and "Install from Web" within CB > Plugin Management > Install a Plugin, which has an "Update All" button in the Updates category (visible if updates are detected).