I expect the absolute distances considered critical for drone operations to be smaller, but still significant.
The level of scrutiny involved in aviation safety is very impressive. I’m not actually involved in the field myself, but find the human factors and systems engineering involved in keeping the skies safe to be very interesting. NTSB and CAA incident reports make fascinating reading!
Many of the hits describe the specific near misses, thus answering your question.
But the question about how many actual problems we are talking about is missing the point. Drones are at an inflection point. People have been flying them for decades as a hobby (they were called "radio control airplanes" back then) without issue, but they're set to become far more popular, far more available, and far easier to use really rapidly. The question is not so much how many problems there are today, but what it'll look like in five or ten years, and how we can get ahead of any potential problems now.
close but no harm done
Are you serious? This is an airplane we're talking about. I don't care how close you think you are or aren't when you're flying your toy around the airport. I don't want the pilot of my airplane to be distracted by your asshat-ery no matter how much distance you think you have from the airplane.
Care to guess whether that was a zero or non-zero distraction as I passed the affected area?
Ok, that's a bit pedantic - search for "airliner drone near miss".
But what are we talking about re: "near miss" here? The phrase itself defines as no actual impact. How many actual problems are we talking about here, vs "close but no harm done"? I'm just trying to bracket the issue.