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If you use the one eyepiece for a prolonged period, then yes an eyepiece heater can be of benefit.
Other measures such as putting the end cap on when not observing also help.
If the conditions necessitate, a couple of eyepieces when not in use, can be kept in your pockets to keep them warm and above dew point.
Even with a dew shield, I found it necessary on occasions to use a dew heater for the corrector plate.
My 12 volt heater controller can manage 4 independent heater straps.
I also would use one for my finder scope.
But that's just what works for me.
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