At the very least, those 10 minutes you're spending meditating are 10 minutes not spent doing something else. Whatever that something else is, would very likely have a different effect. So if anything, meditating is affecting you by displacing something else that would leave its own mark.
In some ways, I think "doing absolutely nothing" is the point of meditation, perhaps you're just not appreciating it yet.
Yes, meditation should deliver noticeable results. If it doesn't then you are doing it wrong.
Pretty sure many of those people simply aren't good at feeling themselves.