To me computers doesn't really have an effect on the data (for how much a computer costs, and how little time in the past it was used, considering the internet was dial-up and was the real cost of using it that made sure you weren't always online).

To me the difference is that we moved to more efficient ways to generate heat, more specifically from electric resistive heating to heat pumps. Both in home heating but also appliances (e.g. cloth driers).

And of course there is climate change, not only we generate heat more efficiently (an heat pump uses at least 1/3 to the power to generate the same amount of heat) but also the climate is less cold, thus less heat required. That is the big difference, not bulbs or computers.

Of course for nations that are more hot in the summer (e.g. my, Italy) the reverse applies, that is more power used because of air conditioning, that 30 years ago nobody had and now it's required since last summer was 25/38C outside for 2 months straight.

Even in Italy, though, peak generation was in 2008.

Germany saw a massive drop too. The only big European country that keeps growing their electricity production is France.