They have thinking layers, the conductor layer can tell everyone else to wait their turn when trying to coordinate a symphony. ADHD typically either has no conductor or the conductor has no arms. Or random sections have weapons grade sonar as instruments.

Edit: Neurotypicals have a conductor that still needs to be trained

I'm not sure about other's amount of thought processes, but there are ways to lessen their impact. Mindfulness meditation helped me recognize and not engage with those thoughts, takes practice but it helps keep your mind on what you're doing rather than other things. Admittedly I haven't kept up with it but I did notice an improvement when was.

No way to actually stop the thoughts as far as I know and to be able to let the thought pass without spending time on it takes practice. Also you tend to fail at it a lot but even then you catch it more quickly to move on.