My wife did the same thing with a long hot shower as well, though she didn't turn the fan on at all. I did the same thing as you and pulled the cover off, unplugged the fan and the condensation was noticeable on the plug. After drying it thoroughly it has been fine for two years.
You might want to consider upgrading the fan if it's no longer drawing the humidity enough, I also found the builder grade fans that come in bathrooms are usually not the greatest and the bare minimum size.
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