Well. Here is my report from the shadows.
Anyway, working for Wikipedia/OSM is totally worth it. As you see it by yourself, the projects are quite successful in delivering quality services to the masses. That's why I'm not advocating people to give up entirely on this "dream". Just take a short pause to ponder why are we starting this movement at the first time.
I'm not alone though, this burnout phenomenon is quite a recurring endemic to any long-time contributors. Some people take a pause [1], and some people left the project entirely [2][3].
[1] : https://meta.wikimedia.org/wiki/Wikistress
[2] : https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Editor_R...
[3] : https://en.wikipedia.org/wiki/Wikipedia:Missing_Wikipedians