I think I can speak for EAs when I say overhead is not the greatest metric by which to judge a charity[1]. I understand why it's an intuitive one, and overhead is probably correlated with measures of effectiveness, but if your targets are concrete enough you can just... actually measure effectiveness.
[1]: https://blog.givewell.org/2009/12/01/the-worst-way-to-pick-a...
If I am trying to do the second (influence behavior of others or multiple givings through sustainable orgs) then I would probably donate to Democratic politicians, not EA.
I'm not a huge fan of the org building stuff, and I think the center for EA especially has been wasteful due to SBF abundance, so my donations go to givewell where I know exactly what I'm "buying".