If high levels of salt is the worst thing you can say about frozen meals then they're pretty damn decent for the convenience they offer!
If I were to use a frozen meal, I'd have to defrost, and then cook, and likely would want something alongside it - like veg or salad. Unless Chef Mike (Microwave) is employed. I find it hard to see this being that much quicker.
I've had one pre-prepared bought in meal this year. Most convenience foods like this have a strange processed taste - that isn't just salt. This is coming from someone whose sense of taste has been shot totally to pieces.
A part that's much quicker is that you just grab a frozen meal from the store, rather than first figuring out what to cook and then searching for ingredients at various sections of the store.
Then for the first few days after you shop, cook the meals you planned. And towards the end of the week, open the fridge/cupboard and think "what needs to be used up?"
The more you do it, the easier it gets.