Valve are really doing some good stuff with the updates to the Steam Workshop. On top of the new features added recently, they've also now put in Workshop Collections you can switch between and share around.
In the latest update posted today, Valve highlighted this new Workshop Collections feature that allows you to make separate lists of mods. So you can create, save and load different subscription lists using this new collections feature - giving you the ability to make preset mods lists and swap between them. On top of that, you can also share them for others to use (you have to save them first before you can share them).
You can access your collections via the game's Properties -> Workshop page under the Advanced Options.
Some other bits Valve updated for it:
- Added the ability to sort items by Time Created or Time Updated.
- Added the ability to sort items in ascending or descending order.
- Added the ability to add or remove all items from the selected section (e.g. item's you've published, favorited, or subscribed to).
- Added ability to quickly remove all items or linked collections.
You need to be in the latest Steam Beta Client to get the Steam Workshop updates.