Thank you @bernhard for this extensive post. I use RockMigrations every day and love it, as I stated often before. It isn't as hard as it looks at first. Just try it out and if you should stumble over something, then just ask for support here in the forum. RockMigrations saves much time and makes it easy to develop features in your dev environment and then when the feature is finished push the changes to the live server with migrations being executed automatically, which creates all fields, templates and even pages and contents. Could live without it, but that would be a sad life.
So.... start using it now!