The all-addons-enabled-on-all-chars problem is “only” when you launch the game (not after each login). So, assuming you do not relaunch the game often, you ideally have the problem only once per day.
To save your sets (global set or per char), use a good addon manager. I recommend “Simple Addon Manager”:
https://www.curseforge.com/wow/addons/simple-addon-manager