The best I have been able to tell is that productivity is like lifting weights, where you have to be always changing up your routine to "shock" the muscles into growth once you hit your plateau. Productivity is a series of brain hacks to keep yourself from falling asleep at the wheel. Like with a relationship, you have to always be doing new things to keep it interesting (don't stop dating your significant other.)
The value of stan systems is...
1. Take notes (documentation) on things.
2. Refer back to those notes (duh, might come in handy later when you find yourself doing the same thing.
3. Keep these notes in the same place.
Do ONLY the above and you probably get enough benefits to be worth it without dropping out because you failed to find the one true way.
Sounds stupid, but the hours I could have saved myself by writing things down for future reference add up. I can't just simply link to documentation, because the time I save is by documenting the spaces between the documentation. Stuff the writers didn't think to write because they already knew everything. But I'm not doing this simple thing if I have already said f*ck it, I give up, because I found the sword in the stone but it didn't choose me. I can't be king, so I go back to filling out spreadsheets.*