I’ve seen a few of these posts over the years and usually I’m not judgy and just give my suggestions but tbh I’m finding it quite annoying this time.
Such a ridiculous waste and doubly so because it’s not just once in a great while but every week! An animal died, and let’s face it, probably had a pretty awful life, too, unless you’re buying the very best of free range, so that you could have food! And there are people up and down the country really, properly finding it difficult to feed themselves and their children well while you glibly throw good meat away every week...
But I guess you know all that. 
So.
I’m sorry but there’s nothing wrong with cold chicken in a sandwich. BLTs are delicious. Otherwise you could make chicken Caesar salad. Which is also delicious and can be assembled in minutes.
Strip the carcass on the night, then at least all the meat will be easily usable when you need to cook and find you’re feeling lazy. Freeze it if you’d rather use it the week after for curry/soup/‘stroganoff’/whatever. Unless it’s going to sit in the freezer forever because you can’t be bothered to use it...then maybe just go ahead and give it straight to the pets.
Chicken legs can be roasted again, just pop them in the oven for 15 min or so to warm through and crisp up the skin nicely.
Easiest fajitas/tacos/quesadillas ever - your meat’s already done, it just needs frying to warm through with veg/spice mix/etc.
Stir fries take 15-20 minutes, tops.
Instant noodles in broth, a bit of thinly sliced chicken, a boiled egg, some spring onion/chilli/coriander and you’ve got a warming and satisfying lunch.
Maybe stop buying a whole chicken for every week. Just have one every other week until you’re properly in the habit of using all of it.