In fact, it's probably rare even without any precautions.
But posters that say no common sense precautions are necessary are just wrong and are risking providing poor advice to other AVS members who may well get IR by treating a plasma as if it were an LED.
And posters who keep beating a 10-year-old drum are risking scare-mongering. No, they're doing more than risking it actually.
I treat my plasma like a television. I follow the advice I provided elsewhere. I admit that whatever leftover 4:3 still comes into my home pretty much gets stretched at this point (by the DVR I guess...I'm not even sure what's doing it). The DVR also has a screensaver when it's paused for a certain amount of time. The idea that I shouldn't watch 6 hours of NCAA basketball because the score bars might get image retained? I mean that's just ridiculous. Anyone suggesting otherwise should be dismissed.
If you say "I never got it and I did absolutely nothing to prevent it", well I say good for you. But we have many posters who have experienced IR and burn-in and are not crackpots, unknown posters, or people with an agenda.
I should hope I haven't crossed the line and called any meaningful number of those people crackpots. I'm sure the vast majority of them are sincere.
Follow common sense precautions, particularly when the panel is new, and you should have no significant issues.
Again, if you want to be cautious when your TV is new, I'd say that's a conservative, reasonable thing to do.
Once people start advocating for orbiter use as some kind of image-retention prevention method, I'd say that's like advocating against science. The orbiter cannot prevent image retention, it can merely "smear" the retained area over a slightly larger space. For the pixel orbiter to do what people want to believe it does, it would have to orbit the image by something like 100 pixels. It doesn't do anything near that -- and to do that, you'd need so much overscan, you'd be butchering your image to "prevent" image retention.
From what I can tell, the orbiter is operating in a range that is between 1/2 and a full order of magnitude less than that). If people really want to believe that moving the "channel bug" around by less than the size of the channel bug can help them, hey, go ahead. It's pretty harmless to run the orbiter from what I can see. Once you understand you are chopping off all four sides of the image -- and you are -- the orbiter's action seems fairly imperceptible. In fact, it's so imperceptible I'm confident the very thing a lot of people think is happening isn't coming remotely close to happening.
If you are considering buying a plasma TV and think that to enjoy it you need to not just use it as a television but instead must obsess over it and worry that it will somehow become damaged by using it like a television, you have two choices. One: Get over it and enjoy your TV. Or, better yet, two: just buy an LCD TV. Once you believe the mostly nonsensical construct of worry, you will probably never be able to stop worrying. The LCD will end your worry.
(To those of you with Panasonic plasmas that are actually suffering from image retention, you do have my sympathy by the way. To those of you considering the Samsung F8500, please consider my advice seriously. The Samsung sounds great, but no TV should require any kind of worrying around how you use it.)