Hello Symbianas, and welcome to Seven Forums.
You can do this below do so.
1. Set all folders to have the same folder template of your choice.
Folder Template - Default
2. Now, change the folder view to have "Medium Icons", and apply these changes to all folders with the same folder template. Since you changed all folder to have the same template in step 1 above, all folders (except libraries) will have this folder view now when applied.
Hope this helps,