My dishwasher, as is fairly normal is tapped into the kitchen sink pipework and I regularly do a manual filter clean followed by a chemical clean on a very hot cycle. I think, but no proof, this also has the effect of keeping the standard sink trap and pipework clean too.
You've reminded me that I need to do a de-gunge of the bathroom sink trap, this time I'm going to try one of the proprietary overnight unblockers. Washing machines need regular cleaning cycles too.

We have click-clack popup wastes on the basins. They get some hair trapped on the mountings under where the stopper pushes into, but it's fairly easy to unscrew the stopper and fish the hair out with a piece of wire or whatever.

Sinks have pull-out baskets at the top of the waste that catch most of the rubbish. Shower drains have removable tops and hair catches underneath and again is easily removed.

Haven't had any problems with drains as yet. Well apart from improperly mounted manhole covers that had to be rebuilt. And this summer we discovered that the standpipe for the washing machine drain hasn't got a trap fitted, so when the wind is in a particular direction we get some whiffs in the utility room. Haven't decided whether it's worth doing something about that yet. Flushing the loo that's above it on the stack makes the smell go away for now.