In the summer, we eat loads of quick no or low-cook salads and light meals for summer evenings such as:
Tuna (or salmon) Nicoise with the usual boiled egg, boiled new potatoes and so on; crusty bread or breadsticks (DH likes to get the pre-made Pizza Express house dressing and imagine we are eating out 
)
A big Greek salad - chopped tomatoes, cucumber, feta, Greek basil, olives and red onion, with pittas popped in the toaster, tzatziki
Falafels and pittas, warmed in the oven and toaster for a few mins, with houmous, salad, some 3-min packet couscous you can do with a kettle, can also get jars of stuffed vine leaves and Gigantes beans, or ready-made spinach and feta pastries
Some salmon pieces, either lightly grilled with lemon and served with (again quick 3-min packet) couscous and a green salad; or grilled brushed with soy, honey and dried chilli and served with rice and steamed broccoli
Warm pasta salad - fry red onion, peppers, mushroom; add chopped courgette and/or aubergine if you want; when soft but not too soft, add to cooked pasta, and add a bit of dried herbs de provence, a dash of olive oil, salt and pepper, and either chopped feta, or a tin of decent tuna (in water not oil), or add lardons to the veg when frying. Can be made in advance and also eaten cold the next day, yum.
We are also big fans of a light soup with crusty bread (mostly pre-made fresh soup but occasionally home-made); and of just a spread of salad, bread cold meats, cheese, fruit and yoghurt.
It's also worth having some lovely childhood comfort meals every so often - beans and cheese on toast or jacket potatoes; sardines on toast seasoned with herbs, lemon and pepper; poached or scrambled egg on toast; tinned tomato soup.