I use loads: big family and no dishwasher. Everyone always taking a clean one when it is their turn to dry up.. I only ever wash them on 30 which I find perfectly adequate and no-one has suffered yet !
Chuck 'em in with towels, bathmats, dishcloths, floorcloths and hankies. Rarely use tea towels for their intended purpose apart from drying/polishing non-dishwasherable glasses! I have, therefore, quite a stash of reasonable looking ones and two from Cadbury World on the wall!
I use an amazing amount of dishcloths though - probably 2/3 per day and they must be cotton!
I definitley use the "chuck it in" method jingle I do loads of washing and simply don't have the time to clart on with seperate loads for this and that. My sister washes all her undies by hand (what?) too much time on her hands that's what I say.
When the things need a wash, do you chuck them in with rest of the washing, or give them a separate hot wash?
For years I collected them up until I had a good economical wash load, and then put them on, on a boil wash. I have recently stopped this and have gone for the chuck 'em in with whatever else method.