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If you are a solo developer, Rails' migrations are the neatest thing since sliced bread. If you work on a team, you know that often it can be a real pain dealing with migrations. Someone on your team checks in a new migration and you don't notice it when you svn up or git pull, and suddenly all your tests are breaking. Or even worse, someone modifies an old migration and you need to reset and migrate up from zero (we're talking development here, not production). I'm not a fan of automatically running migrations (I'll leave the reasons for you to guess), but I do like to be informed of when I'm about to run headfirst into a wall. Saves so much wear and tear on my noggin.