I agree with you to a certain extent but on those sorts of holidays, I :
Don't sweep up sand until the end of the holiday, apart from just brushing any obvious massive piles out of the door 
Don't wash towels until we go home . Just hang them up to dry, any sand stuck to them can be shaken off when dry
Ditto swimming.costumes , though I might quickly rinse those off under a tap before hanging to dry
I would only probably do a maximum of one machine wash in a week away
If definitely have some lunches out 2-3 times in a week. Fish and chips, beach cafe etc. If I am on holiday that is part of the budget . I absolutely refuse to be responsible for cooking/./preparing food twice a day every day while on holiday . That is not a holiday for me .
I'd keep evening meals very very simple
Once children are old enough, clearing up after dinner would be done.all together as a family
I.do agree however that self catering holidays are more work for.parents of young children than all inclusive hotel ones are .
As others have said the beach is easier if you are very close to it . It is the constant early starts to be up early and out of the door to find a parking space that is the killer for.me
The problem is the cost of accommodation very close to a.beach is much higher than one on a farm or in the country and you need.to book really early as they sell out very quickly in the UK because they are popular with tired.parents wanting to reduce their work levels while on holiday