That may be true in the "Rails ecosystem", but Ruby has a really vibrant community of people writing tiny gems for everything. It rarely has one accepted library for one problem, usually, there are 2 or 3. Actually, as a Rubyist, I do feel the same issue when using Python: I don't know my way around the community, thus I never find the hidden gems or which libraries are hot (or not). I thinks its more a problem of perspective then reality.

Granted, no one can match Perl in that respect :).