i like node because it lets me build small standalone programs/apps which i can link together to act like on big project.
i - for one's part - found that having one master-overlord framework kills a lot of the joy of programming.
ok, there is the "it's much more manageable" argument, but well, my experience is that big apps on RoR need much more maintenance work then similar programs on much uglier stacks (i.e. webprojects using LAMP)
said that - after reading some of the docs - i will probably give towerjs a try.