I was going to agree with you, I almost never use the rubyonrails.org main site.
But I tried putting api.rubyonrails.org and apparently that also falls under the rubyonrails.org domain which I use quite a bit for rails dev.
There is some content there, for sure. I used gotapi instead of api.rubyonrails.org most of the time (they have other stuff there too, of course, which is handy). I have since switched to just looking stuff up in the source because I'm pretty familiar with it.
Agreed, never used the main site. Apidock.com is my main source for Rails info. Also I think some of the Ruby micro-frameworks may be gaining popularity.
I came across guides.rubyonrails.org just recently. It's actually very useful. If it was around when I was starting out I would have been there a lot.
As for the microframeworks, I'm with you. I don't build apps in Rails from day 1 anymore, I generally use Sinatra instead and sometimes (for smaller apps) there ends up being no reason to switch to Rails.
Considering my Rails work: I visited rubyonrails.org only once, when I first heard about it - it's primary focus isn't as a resource site and I don't know any other Rails developers that use it as one.
Considering my Django work: I had djangoproject.com open practically all the time, every day, since it's a primary destination for everything related to the project.