Some easy freeze-friendly meals I prepared before my little one arrived were chillies, curries and bolognese. I'd make a big batch and divide them into portions, then pop them into the freezer. It was so handy to just grab one when needed - only having to worry about cooking sides or pasta/rice was a huge time saver!
I also liked to prep some slow cooker meals, again making enough for several servings. They were so convenient - especially on days when I had my hands full with the newborn and didn't have the energy to think about dinner. Just dump everything in the slow cooker in the morning, and dinner was pretty much sorted!
Some other ideas I found handy were freezer-friendly puréed fruits or veggies for baby's first foods - they were quick and easy to defrost, and my little one loved them! And of course, there's always space for ice cube trays filled with purées or breastmilk!