After the experience of a slow burn and "last all night" in the free standing wood-burner, I hated to see the wood in the fireplace burn up so rapidly, so until I had the conversion, I bet I didn't use the fireplace for quite a number of years. I use the fireplace more now that its been converted to LP, but like you, I still use it somewhat infrequently.
The ceiling cable heat must have been a temporary trend back in the 70's. A year or so ago, I had a young technician from our rural electric cooperative stop in for a check of our circuit breakers, and a discussion of one thing leading to the next, and the ceiling cable heat came up - he didn't know that it existed!
Whole house In-floor radiant heat is usually 1/2" to 3/4" tubing filled with a water based material and heated and circulated with a pump. The heat source is still either oil or electric.
I didn't mention above that I also had installed electric radiant floor heating under the ceramic tile in our kitchen. That is also via electric cable or wires.