Also, the gas price of my dad increased from 4.8 cents per kWh to 14.2 cents per kWh as an existing customer. People who were moving at the time and were new customers had to sign contracts well above 20 cents per kWh.
So, you probably only didn't "notice any difference" if you have either deep pockets or your energy supplier has a very foresighted buying strategy for a period of more than 1.5 years. (Many utility providers don't do this because they are speculators at the same time. Few like to pay a premium for forward contracts in the far future).
I live far to the north, in an apartment, and didn't notice anything this winter, wherever I went. But I heard someone in their villa here nearby actually moved elsewhere, over the winter, because of the high cost of heating
Edit: by villa we typically mean a house that is not adjacent to another house.