You have no idea why this is so exciting (BLOG POST) Something I didn't add to the blog as I felt it was more appropriate for general chat here, but it also has two key implications: One is you download via Valves CDN, meaning faster downloads and also that it means gamemodes that have platinum custom models don't require to wait 30 minutes to get in. Download the addon and bam, sorted in all of twenty seconds. Keep in mind that at the moment this only works with content on the workshop, so say iceworld won't be downloaded via the Workshop.
Wait times are awful, and certainly put me off a server I'm not entirely sure I want to join. But at the same time they're a (if annoying) part of Gmod, and anything that helps to counter that is certainly going to be received well in the long run!