With rails, there are really only a handful conventions, and while they take a little time to learn (table names plural, model names singular, controllers plural, name view files based on controller/action, foreign keys names in the obvious way) and that's about it. Once you have that you can look at a URL and know exactly where the code is. That is really valuable and worth a little effort.

There isn't much magic in rails, and just stepping through the methods in a debugger makes everything pretty clear if you do want to know exactly how everything is wired up.