Public restroom usability. I find myself noticing placement of hand drier/paper towel dispenser in relation to the sinks and making judgements about that. Plus I cannot stand the automatic water and soap dispensers that work about ⅔ of the time. Finally, sink faucets designed so that I basically have to have my hands right under them so that I’m splashing so much water on the counter rather than in the sink. So many poor design choices in public restrooms.
The one that really drives me nuts is when the faucet is too short/too far back meaning that your knuckles are constantly hitting the rear edge of the sink in order to get your palms under the stream. This is especially annoying when it's in an otherwise large sink!
That drives me up the wall. Last summer, I went on a vacation to a rental home that had this issue. After a couple of days of rubbing my hands on the back of the sink just to get them wet, I went to the store and bought a cheap funnel. I used my Swiss Army knife to cut off the base of the funnel, and I shoved it onto the sink. Problem solved!
If the water pressure was higher (or if the aerator was less restricted) it probably wouldn't have been an issue, given the angle of the faucet. It's still ridiculous that shit like this happens.