Those people at Starbucks who tie up the milk counter fine tuning their drink

Nothing gets my day off to a bad start like waiting to put half & half in my coffee while someone is monopolizing the counter tweaking the amount of milk and/or sugar in their drink. I've literally seen people take four test sips, giving a long thoughtful pause after each one before deciding what needs to be adjusted. I no longer take sugar, but when I did I was adept enough at it to know about how much to put in the first time, and if it wasn't the exact level of sweetness I wanted so be it. Same with the milk, which is even easier because you can gauge is visually. I want to dump my scalding hot grande Pike on them. No reason to be there more than 30 seconds, imo.