Something I really like about working on my Macintosh Plus is that event loops in the system and applications often respond to the mouse and keyboard before window redrawing, so as I remember where things will appear in a window I'm familiar with, I can click or use a keyboard command to do something before the window is even fully redrawn. When I'm closing a dialog or an old window that was just brought forward, it saves time not having to wait for it to draw just so it can be dismissed.
It makes me feel like I'm able to think faster than the machine which seems like it would be a negative but it's rewarding.
On a modern machine, I'm so often frustrated at web pages that are mostly drawn but blocking on some stupid Javascript or font download that won't let me interact with it yet, even though I'm just trying to click something to get off of that page anyway.