On what type of monitor ?
I still have issues on a 2004 24" Dell LCD. It requires loops of white black cycles every day for at least 30 minutes to remove the after images of my windows desktop, even if the desktop monitor is only on for 3 hours. Every single user can see the horrible image retention on this monitor. Its almost image burn in, but since its fixable itsnot considered burn in.
The gaming image retention, which is not burn in and does get resolved quickly, was on a 54" Plasma and only happens after weeks of gaming the same game for 6 hours a day but it is resolved quickly by running its white bar sweep pattern. Also just watching normal video resolves it as well, butthat takes a bit longer. Normal users cant tell its even there, but i can tell its there if I display a completely black screen, I notice the parts where the game hud isnt as black as the other parts. Some might not even call it image retention, since its not that the display pixels are stuck bright or on, they just dont hit the same exact black levels as the others.
Since you werent even aware of motion resolution, you wouldnt even notice what I call image retention on my Plasma.