Monolithic frameworks are plentiful in the PHP community, but recently some of the larger frameworks have started moving toward this aggregate component model. Unfortunately, the PHP frameworks are much older than node.js, so many of the corresponding micro-communities are entrenched in the idea that their framework is "best". This means that while it is awesome that frameworks are allowing you to consume individual components, you still do not see it happening very frequently. You almost never see the frameworks themselves sharing components, for example.
Obviously the module system baked into node.js helps steer the community toward the concept of consuming modules, but I'm optimistic that the community is also young enough to completely embrace the idea of frameworks being little more than aggregates of the most common modules for building apps and also that "sharing" between frameworks is not something to frown upon.