Are you a gamer? Otherwise it's really not easy to notice a "slideshow" at 60 Hz.

Moving the mouse around at anything below 90Hz is pretty rough.

No. I guess everyone has different levels of sensitivity to refresh rates. It is immediately noticeable and very distracting to me when using a 60hz display.

It's not acceptable on a high-end laptop nowadays (120hz minimum). Imagine the reduction in headaches, fatigue and nausea if we stopped tolerating this penny-pinching.