Do or Don't? Foil as an Electric Oven Liner

I've moved in and out of eight different rentals in the last nine years, which means I've done my fair share of post-move-out cleaning. The one task I always dread is cleaning the oven. I hate using toxic oven cleaner, yet it seems to be the only effective combatant against that hardened puddle of food crumbs, melted cheese, and pie juice from a year of careless cooking. So when someone told me about this cheap and easy trick during my stay at rental #5, I never looked back...