I notice this all the time with your 'normal' user. The scroll bar is quite possibly the most horrific unfriendly control. It's just too narrow. Those users that don't have that much control of a pointer, struggle with scroll bars and small buttons / drop downs etc.

I like the Apple way of placing controls on the left, but having a scroll bar on the right negates a lot of the benefit of doing so.

Having said that they are quite handy as page length / where you are indicators.