SUMMARY
I've set my bottom panel so that it can be covered by windows. I don't want it to waste space when I'm using a maximized window.
What then happens is that when I and try to access something at the bottom of the current window, I will accidentally hit the mouse pointer against the bottom of the screen. The panel appears, covers what I wanted to reach and takes a while to disappear again. It's probably just a second, but it feels like ages, which is very annoying when I quickly want to do something.
I suggest a tiny delay, maybe with a setting, to prevent the panel from being displayed when the user just accidentally hits the bottom of the screen.

STEPS TO REPRODUCE
1. Set panel to autohide/be covered by windows
2. Accidentally hit bottom of screen, immeadiately moving the mouse somewhere else.
3. Panel appears

OBSERVED RESULT
I accidentally make the panel appear when I didn't want to

EXPECTED RESULT
The panel only appears when I deliberately move the mouse to the bottom edge of the screen. This usually means it stays there for longer.