--- Quote Start ---
Note: closing the find dialog and going to the text is very slightly more efficient of the two methods. But it's at the cost of much more inefficiency when people don't realize what F3 is for.
--- Quote End ---
To find the occurrence I'm looking for, in other applications I often search repeatedly by simply pressing <Enter> multiple times. Leaving the Find dialog box open with the focus on the Find Next command is more efficient for that. It's easy to hit <Escape> without giving it a second thought to close the box after a single search. I'd be annoyed by having to reopen the dialog box repeatedly to search over and over for the same thing, but not as annoyed as I am by the current Quartus text editor behavior.