I agree on the approach, and I try my best, but it isn't easily. You almost have to make food preparation a hobby.
The problem is, back in the day people learnt the skills to prepare food out of necessity. Now you have to want to do it. I suggest a good book on a favourite cuisine. Convince yourself that what you cook at home is nicer than the shit you can buy in shops and you won't want it any more. Don't forget to give your own food a chance and put just as much salt in it as they do, though. I see this mistake a lot. People think prepared/processed food is nicer just because it has more salt. Use salt.
And no, not everything can go in the dishwasher.