I don't really find "big" meals to be all that challenging unless you are really going all out with each component of the meal. In most cases it simply means spending some time making the main dish, then towards the very end throwing together a few quick side dishes and a salad & desert. A salad takes minutes to throw together, especially if you are using the bagged and chopped lettuce. Side dishes can also be done in minutes as well. How hard is it to scrub and prick some potatoes to throw in the oven for baked potatoes? Then perhaps chop up some toppings for them. Steamed veggies? Those also only take minutes, even if you are buying and prepping them fresh. Just steam them, and toss with some butter/olive oil, fresh herbs and season.
Plus, a lot of main dishes that are slow roasted in the oven, require little to no supervision while cooking. You just throw them in the oven and let the slow roasting work it's magic. A simple beef or pork pot roast can be assembled in minutes. I don't even bother browning them first in a frying pan - I just remove the cover on the meat during the last hour or 30 minutes of cooking to let the exterior brown and crisp.
Plus there are many things such as mashed potatoes, stuffing, gravies and such which can be made well in advance - so you aren't scrambling all at once.